CVE-2026-58226 (GCVE-0-2026-58226)

Vulnerability from cvelistv5 – Published: 2026-07-06 09:03 – Updated: 2026-07-06 14:04
VLAI
Title
Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax
Summary
Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding. hpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. 'Elixir.HPAX.Types':decode_remaining_integer/3 accumulates the integer as int + (value <<< m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the 'Elixir.HPAX':decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification. This issue affects hpax from 0.1.1 before 1.0.4.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
EEF
References
Impacted products
Vendor Product Version
elixir-mint hpax Affected: 0.1.1 , < 1.0.4 (semver)
    cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*
 Create a notification for this product.
elixir-mint hpax Affected: 56db437a7e2c515e3bdd770ac7947b02cd2390d0 , < 1ba4bb2dc91e80089cf89c73970ac3ded76f17eb (git)
    cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Peter Ullrich Andrea Leopardi Jonatan Männchen / EEF Eric Meadows-Jönsson
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-58226",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-06T12:49:38.954923Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-06T12:49:52.028Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.HPAX",
            "Elixir.HPAX.Types"
          ],
          "packageName": "hpax",
          "packageURL": "pkg:hex/hpax",
          "product": "hpax",
          "programFiles": [
            "lib/hpax.ex",
            "lib/hpax/types.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.HPAX\u0027:decode/2"
            },
            {
              "name": "\u0027Elixir.HPAX.Types\u0027:decode_integer/2"
            },
            {
              "name": "\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3"
            }
          ],
          "repo": "https://github.com/elixir-mint/hpax",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "1.0.4",
              "status": "affected",
              "version": "0.1.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.HPAX",
            "Elixir.HPAX.Types"
          ],
          "packageName": "elixir-mint/hpax",
          "packageURL": "pkg:github/elixir-mint/hpax",
          "product": "hpax",
          "programFiles": [
            "lib/hpax.ex",
            "lib/hpax/types.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.HPAX\u0027:decode/2"
            },
            {
              "name": "\u0027Elixir.HPAX.Types\u0027:decode_integer/2"
            },
            {
              "name": "\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3"
            }
          ],
          "repo": "https://github.com/elixir-mint/hpax",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "1ba4bb2dc91e80089cf89c73970ac3ded76f17eb",
              "status": "affected",
              "version": "56db437a7e2c515e3bdd770ac7947b02cd2390d0",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "1.0.4",
                  "versionStartIncluding": "0.1.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "AND"
            }
          ],
          "operator": "OR"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Peter Ullrich"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Andrea Leopardi"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Jonatan M\u00e4nnchen / EEF"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Eric Meadows-J\u00f6nsson"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eInefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.\u003c/p\u003e\u003cp\u003e\u003ctt\u003ehpax\u003c/tt\u003e decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. \u003ctt\u003e\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3\u003c/tt\u003e accumulates the integer as \u003ctt\u003eint + (value \u0026lt;\u0026lt;\u0026lt; m)\u003c/tt\u003e, shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the \u003ctt\u003e\u0027Elixir.HPAX\u0027:decode/2\u003c/tt\u003e entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.\u003c/p\u003e\u003cp\u003eThis issue affects \u003ctt\u003ehpax\u003c/tt\u003e from 0.1.1 before 1.0.4.\u003c/p\u003e"
            }
          ],
          "value": "Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.\n\nhpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. \u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3 accumulates the integer as int + (value \u003c\u003c\u003c m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the \u0027Elixir.HPAX\u0027:decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.\n\nThis issue affects hpax from 0.1.1 before 1.0.4."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-130",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-130 Excessive Allocation"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "CWE-407 Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-06T14:04:14.632Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "related"
          ],
          "url": "https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-58226.html"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-58226"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/elixir-mint/hpax/commit/1ba4bb2dc91e80089cf89c73970ac3ded76f17eb"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-58226",
    "datePublished": "2026-07-06T09:03:47.374Z",
    "dateReserved": "2026-06-29T18:54:08.633Z",
    "dateUpdated": "2026-07-06T14:04:14.632Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-58226\",\"sourceIdentifier\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"published\":\"2026-07-06T11:16:31.143\",\"lastModified\":\"2026-07-06T13:17:07.333\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.\\n\\nhpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. \u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3 accumulates the integer as int + (value \u003c\u003c\u003c m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the \u0027Elixir.HPAX\u0027:decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.\\n\\nThis issue affects hpax from 0.1.1 before 1.0.4.\"}],\"affected\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"affectedData\":[{\"vendor\":\"elixir-mint\",\"product\":\"hpax\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.hex.pm\",\"packageName\":\"hpax\",\"cpes\":[\"cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*\"],\"modules\":[\"Elixir.HPAX\",\"Elixir.HPAX.Types\"],\"programFiles\":[\"lib/hpax.ex\",\"lib/hpax/types.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.HPAX\u0027:decode/2\"},{\"name\":\"\u0027Elixir.HPAX.Types\u0027:decode_integer/2\"},{\"name\":\"\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3\"}],\"repo\":\"https://github.com/elixir-mint/hpax\",\"packageURL\":\"pkg:hex/hpax\",\"versions\":[{\"version\":\"0.1.1\",\"lessThan\":\"1.0.4\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"elixir-mint\",\"product\":\"hpax\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"elixir-mint/hpax\",\"cpes\":[\"cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*\"],\"modules\":[\"Elixir.HPAX\",\"Elixir.HPAX.Types\"],\"programFiles\":[\"lib/hpax.ex\",\"lib/hpax/types.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.HPAX\u0027:decode/2\"},{\"name\":\"\u0027Elixir.HPAX.Types\u0027:decode_integer/2\"},{\"name\":\"\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3\"}],\"repo\":\"https://github.com/elixir-mint/hpax\",\"packageURL\":\"pkg:github/elixir-mint/hpax\",\"versions\":[{\"version\":\"56db437a7e2c515e3bdd770ac7947b02cd2390d0\",\"lessThan\":\"1ba4bb2dc91e80089cf89c73970ac3ded76f17eb\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-06T12:49:38.954923Z\",\"id\":\"CVE-2026-58226\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-407\"}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-58226.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-mint/hpax/commit/1ba4bb2dc91e80089cf89c73970ac3ded76f17eb\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-58226\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-58226\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-06T12:49:38.954923Z\"}}}], \"references\": [{\"url\": \"https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-06T12:49:22.337Z\"}}], \"cna\": {\"title\": \"Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Andrea Leopardi\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Eric Meadows-J\\u00f6nsson\"}], \"impacts\": [{\"capecId\": \"CAPEC-130\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-130 Excessive Allocation\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-mint/hpax\", \"vendor\": \"elixir-mint\", \"modules\": [\"Elixir.HPAX\", \"Elixir.HPAX.Types\"], \"product\": \"hpax\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.1.1\", \"lessThan\": \"1.0.4\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/hpax\", \"packageName\": \"hpax\", \"programFiles\": [\"lib/hpax.ex\", \"lib/hpax/types.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.HPAX\u0027:decode/2\"}, {\"name\": \"\u0027Elixir.HPAX.Types\u0027:decode_integer/2\"}, {\"name\": \"\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3\"}]}, {\"cpes\": [\"cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-mint/hpax\", \"vendor\": \"elixir-mint\", \"modules\": [\"Elixir.HPAX\", \"Elixir.HPAX.Types\"], \"product\": \"hpax\", \"versions\": [{\"status\": \"affected\", \"version\": \"56db437a7e2c515e3bdd770ac7947b02cd2390d0\", \"lessThan\": \"1ba4bb2dc91e80089cf89c73970ac3ded76f17eb\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/elixir-mint/hpax\", \"packageName\": \"elixir-mint/hpax\", \"programFiles\": [\"lib/hpax.ex\", \"lib/hpax/types.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.HPAX\u0027:decode/2\"}, {\"name\": \"\u0027Elixir.HPAX.Types\u0027:decode_integer/2\"}, {\"name\": \"\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3\"}]}], \"references\": [{\"url\": \"https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-58226.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-58226\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/elixir-mint/hpax/commit/1ba4bb2dc91e80089cf89c73970ac3ded76f17eb\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.\\n\\nhpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. \u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3 accumulates the integer as int + (value \u003c\u003c\u003c m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the \u0027Elixir.HPAX\u0027:decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.\\n\\nThis issue affects hpax from 0.1.1 before 1.0.4.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eInefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.\u003c/p\u003e\u003cp\u003e\u003ctt\u003ehpax\u003c/tt\u003e decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. \u003ctt\u003e\u0027Elixir.HPAX.Types\u0027:decode_remaining_integer/3\u003c/tt\u003e accumulates the integer as \u003ctt\u003eint + (value \u0026lt;\u0026lt;\u0026lt; m)\u003c/tt\u003e, shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the \u003ctt\u003e\u0027Elixir.HPAX\u0027:decode/2\u003c/tt\u003e entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.\u003c/p\u003e\u003cp\u003eThis issue affects \u003ctt\u003ehpax\u003c/tt\u003e from 0.1.1 before 1.0.4.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-407\", \"description\": \"CWE-407 Inefficient Algorithmic Complexity\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.0.4\", \"versionStartIncluding\": \"0.1.1\"}], \"operator\": \"AND\"}], \"operator\": \"OR\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-07-06T14:04:14.632Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-58226\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-06T14:04:14.632Z\", \"dateReserved\": \"2026-06-29T18:54:08.633Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-07-06T09:03:47.374Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.