Vulnerability-Lookup

alsa-2026:16252

Vulnerability from osv_almalinux

Published

2026-05-12 00:00

Modified

2026-05-13 08:31

Summary

Important: jq security update

Details

jq is a lightweight and flexible command-line JSON processor. jq is like sed for JSON data. You can use it to slice, filter, map, or transform structured data with the same ease that sed, awk, grep, or similar applications allow you to manipulate text.

Security Fix(es):

jq: out-of-bounds read in jv_parse_sized() on error formatting for non-NUL-terminated buffers (CVE-2026-39979)
jq: jq: Denial of Service via crafted JSON object causing hash collisions (CVE-2026-40164)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:16252	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-39979	REPORT
	https://access.redhat.com/security/cve/CVE-2026-40164	REPORT
	https://bugzilla.redhat.com/2458077	REPORT
	https://bugzilla.redhat.com/2458084	REPORT
	https://errata.almalinux.org/8/ALSA-2026-16252.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "jq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.6-12.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "jq-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.6-12.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "jq is a lightweight and flexible command-line JSON processor. jq is like sed for JSON data. You can use it to slice, filter, map, or transform structured data with the same ease that sed, awk, grep, or similar applications allow you to manipulate text.  \n\nSecurity Fix(es):  \n\n  * jq: out-of-bounds read in jv_parse_sized() on error formatting for non-NUL-terminated buffers (CVE-2026-39979)\n  * jq: jq: Denial of Service via crafted JSON object causing hash collisions (CVE-2026-40164)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:16252",
  "modified": "2026-05-13T08:31:07Z",
  "published": "2026-05-12T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:16252"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-39979"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-40164"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2458077"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2458084"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2026-16252.html"
    }
  ],
  "related": [
    "CVE-2026-39979",
    "CVE-2026-40164"
  ],
  "summary": "Important: jq security update"
}

CVE-2026-39979 (GCVE-0-2026-39979)

Vulnerability from cvelistv5 – Published: 2026-04-13 22:18 – Updated: 2026-04-14 13:43

Title

jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted Buffers

Summary

jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jv_string_fmt(), which reads until a NUL terminator is found rather than respecting the caller-supplied length. This means that when malformed JSON is passed in a non-NUL-terminated buffer, the error construction logic performs an out-of-bounds read past the end of the buffer. The vulnerability is reachable by any libjq consumer calling jv_parse_sized() with untrusted input, and depending on memory layout, can result in memory disclosure or process termination. The issue has been patched in commit 2f09060afab23fe9390cce7cb860b10416e1bf5f.

Severity ?

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/jqlang/jq/security/advisories/…	x_refsource_CONFIRM
https://github.com/jqlang/jq/commit/2f09060afab23…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
jqlang	jq	Affected: < 2f09060afab23fe9390cce7cb860b10416e1bf5f

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39979",
                "options": [
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                    "Exploitation": "poc"
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                    "Automatable": "yes"
                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-04-14T13:43:11.607182Z",
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      ],
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            "attackRequirements": "NONE",
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            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "vulnConfidentialityImpact": "LOW",
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          "descriptions": [
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      "title": "jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted Buffers"
    }
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  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
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    "dateReserved": "2026-04-08T00:01:47.628Z",
    "dateUpdated": "2026-04-14T13:43:15.227Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-40164 (GCVE-0-2026-40164)

Vulnerability from cvelistv5 – Published: 2026-04-13 23:40 – Updated: 2026-04-14 19:27

Title

jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed

Summary

jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n²) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-328 - Use of Weak Hash
CWE-407 - Inefficient Algorithmic Complexity

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/jqlang/jq/security/advisories/…	x_refsource_CONFIRM
https://github.com/jqlang/jq/commit/0c7d133c3c7e3…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
jqlang	jq	Affected: < 0c7d133c3c7e37c00b6d46b658a02244fdd3c784

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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          {
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                "id": "CVE-2026-40164",
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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.

Action not permitted

alsa-2026:16252

Vulnerability from osv_almalinux

CVE-2026-39979 (GCVE-0-2026-39979)

CVE-2026-40164 (GCVE-0-2026-40164)

Tags

Sightings

Nomenclature