Vulnerability-Lookup

SUSE-SU-2026:2307-1

Vulnerability from csaf_suse - Published: 2026-06-09 08:12 - Updated: 2026-06-09 08:12

Summary

Security update for nginx

Severity

Important

Notes

Title of the patch: Security update for nginx

Description of the patch: This update for nginx fixes the following issue - CVE-2026-9256: heap buffer overflow in the `ngx_http_rewrite_module` when using a configuration with overlapping captures (bsc#1266215).

Patchnames: SUSE-2026-2307,SUSE-SLE-Module-Server-Applications-15-SP7-2026-2307,SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-2307,SUSE-SLE-Product-SLES_SAP-15-SP6-2026-2307

CVE-2026-9256

8.1 (High)


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

Affected products

Recommended 13 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:nginx-1.21.5-150600.10.21.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:nginx-1.21.5-150600.10.21.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:nginx-1.21.5-150600.10.21.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:nginx-1.21.5-150600.10.21.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:nginx-source-1.21.5-150600.10.21.1.noarch	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP6-LTSS:nginx-1.21.5-150600.10.21.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP6-LTSS:nginx-1.21.5-150600.10.21.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP6-LTSS:nginx-1.21.5-150600.10.21.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP6-LTSS:nginx-1.21.5-150600.10.21.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 15 SP6-LTSS:nginx-source-1.21.5-150600.10.21.1.noarch	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP6:nginx-1.21.5-150600.10.21.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP6:nginx-1.21.5-150600.10.21.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 15 SP6:nginx-source-1.21.5-150600.10.21.1.noarch	—	Vendor Fix

Threats

Impact important

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-updates/2026…	self
https://bugzilla.suse.com/1266215	self
https://www.suse.com/security/cve/CVE-2026-9256/	self
https://www.suse.com/security/cve/CVE-2026-9256	external
https://bugzilla.suse.com/1266215	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-9256",
      "ids": [
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          "text": "https://www.suse.com/security/cve/CVE-2026-9256"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
          "title": "CVE description"
        }
      ],
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          "summary": "SUSE Bug 1266215 for CVE-2026-9256",
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        }
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      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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      "scores": [
        {
          "cvss_v3": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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      "title": "CVE-2026-9256"
    }
  ]
}

CVE-2026-9256 (GCVE-0-2026-9256)

Vulnerability from cvelistv5 – Published: 2026-05-22 14:11 – Updated: 2026-08-25 12:05 X_F5

Title

NGINX ngx_http_rewrite_module vulnerability

Summary

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Severity

8.1 (High)


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

9.2 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-22 00:00 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

f5 mitre root

References

15 references

URL	Tags
https://my.f5.com/manage/s/article/K000161377	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…
https://lists.debian.org/debian-lts-announce/2026…
https://access.redhat.com/security/cve/CVE-2026-9256	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480746	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:29874	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28921	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28212	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28973	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29151	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33313	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20351	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44481	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:58981	vendor-advisoryx_refsource_REDHAT

Impacted products

15 products

Vendor	Product	Version
F5	NGINX Plus	Affected: 37.0 , < 37.0.1.1 (custom) Affected: R36 , < R36 P5 (custom) Affected: R32 , < R32 P7 (custom)
F5	NGINX Open Source	Affected: 1.31.0 , < 1.31.1 (custom) Affected: 1.30.0 , < 1.30.2 (custom) Affected: 0.1.17 , ≤ 0.9.7 (custom)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 2:1.26.3-6.el10_2.4 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260611094050.489197e6 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 9080020260610161820.9 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 2:1.20.1-28.el9_8.3 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 9080020260609152155.9 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Discovery 2	Unaffected: 1782756541 , < * (rpm) cpe:/a:redhat:discovery:2::el9
Red Hat	Red Hat Hardened Images	Unaffected: 1.30.2-1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1784794818 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1784794778 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1784795076 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1787241211 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1787241260 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Lightspeed proxy 1	cpe:/a:redhat:insights_proxy:1

Date Public

2026-05-22 14:00

Credits

"F5 acknowledges Mufeed VH of Winfunc Research, Nebula Security (@nebusecurity), and Vexera AI for bringing this issue to our attention and following the highest standards of coordinated disclosure."

Show details on NVD website

JSON

To clipboard

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          ],
          "value": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.2,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122 Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-28T18:20:47.449Z",
        "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "shortName": "f5"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://my.f5.com/manage/s/article/K000161377"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
        "x_F5"
      ],
      "title": "NGINX ngx_http_rewrite_module vulnerability",
      "x_generator": {
        "engine": "F5 SIRTBot v1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
    "assignerShortName": "f5",
    "cveId": "CVE-2026-9256",
    "datePublished": "2026-05-22T14:11:41.877Z",
    "dateReserved": "2026-05-21T20:58:58.484Z",
    "dateUpdated": "2026-08-25T12:05:55.163Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.