Vulnerability-Lookup

OESA-2026-2511 (CVE-2026-40701)

Vulnerability from osv_openeuler – Published: 2026-05-29 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

nginx security update

Details

NGINX is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server.

Security Fix(es):

NGINX Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-40701)

NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42934)

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42946)

Severity

6.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-40701	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-42934	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-42946	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "nginx-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-debuginfo-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-debugsource-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-mod-devel-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-mod-http-image-filter-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-mod-http-perl-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-mod-http-xslt-filter-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-mod-mail-1.24.0-10.oe2403sp3.aarch64.rpm",
          "nginx-mod-stream-1.24.0-10.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "nginx-all-modules-1.24.0-10.oe2403sp3.noarch.rpm",
          "nginx-filesystem-1.24.0-10.oe2403sp3.noarch.rpm",
          "nginx-help-1.24.0-10.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "nginx-1.24.0-10.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "nginx-1.24.0-10.oe2403sp3.x86_64.rpm",
          "nginx-debuginfo-1.24.0-10.oe2403sp3.x86_64.rpm",
          "nginx-debugsource-1.24.0-10.oe2403sp3.x86_64.rpm",
          "nginx-mod-devel-1.24.0-10.oe2403sp3.x86_64.rpm",
          "nginx-mod-http-image-filter-1.24.0-10.oe2403sp3.x86_64.rpm",
          "nginx-mod-http-perl-1.24.0-10.oe2403sp3.x86_64.rpm",
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          "nginx-mod-mail-1.24.0-10.oe2403sp3.x86_64.rpm",
          "nginx-mod-stream-1.24.0-10.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "nginx",
        "purl": "pkg:rpm/openEuler/nginx\u0026distro=openEuler-24.03-LTS-SP3"
      },
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        {
          "events": [
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              "introduced": "0"
            },
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              "fixed": "1.24.0-10.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "NGINX is a free, open-source, high-performance HTTP server and reverse proxy,  as well as an IMAP/POP3 proxy server.\r\n\r\nSecurity Fix(es):\n\nNGINX Open Source have a vulnerability in the ngx_http_ssl_module\u00a0module when the ssl_verify_client\u00a0directive is set to \u0026quot;on\u0026quot; or \u0026quot;optional,\u0026quot; and the ssl_ocsp\u00a0directive is set to \u0026quot;on\u0026quot; or the leaf\u00a0parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting.\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-40701)\n\nNGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map\u00a0and proxy_pass\u00a0with disabled buffering (\u0026quot;off\u0026quot;) directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers\u0026apos; control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42934)\n\nA vulnerability exists in the ngx_http_scgi_module\u00a0and ngx_http_uwsgi_module\u00a0modules that may result in excessive memory allocation or an over-read of data. When scgi_pass\u00a0or uwsgi_pass\u00a0is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.\u00a0 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.(CVE-2026-42946)",
  "id": "OESA-2026-2511",
  "modified": "2026-08-06T11:11:27Z",
  "published": "2026-05-29T11:11:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2511"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40701"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42934"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42946"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nginx security update",
  "upstream": [
    "CVE-2026-40701",
    "CVE-2026-42934",
    "CVE-2026-42946"
  ]
}

CVE-2026-40701 (GCVE-0-2026-40701)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-05-13 16:07

Title

NGINX ngx_http_ssl_module vulnerability

Summary

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Severity

4.8 (Medium)


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

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 15:55 UTC

CWE

CWE-416 - Use After Free

Assigner

f5 mitre root

References

1 reference

URL	Tags
https://my.f5.com/manage/s/article/K000161021	vendor-advisorypatch

Impacted products

2 products

Vendor	Product	Version
F5	NGINX Plus	Unaffected: R37 , < * (custom) Affected: R36 , < R36 P4 (custom) Affected: R32 , < R32 P6 (custom)
F5	NGINX Open Source	Unaffected: 1.31.0 , < * (semver) Affected: 1.19.0 , < 1.30.1 (semver)

Date Public

2026-05-13 14:00

Credits

F5 acknowledges Zhenpeng (Leo) Lin of depthfirst 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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CVE-2026-42934 (GCVE-0-2026-42934)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-06-08 20:34

Title

NGINX ngx_http_charset_module vulnerability

Summary

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Severity

4.8 (Medium)


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

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 15:55 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

f5 mitre root

References

1 reference

URL	Tags
https://my.f5.com/manage/s/article/K000161028	vendor-advisorypatch

Impacted products

2 products

Vendor	Product	Version
F5	NGINX Plus	Unaffected: R37 , < * (custom) Affected: R36 , < R36 P4 (custom) Affected: R32 , < R32 P6 (custom)
F5	NGINX Open Source	Unaffected: 1.31.0 , < * (semver) Affected: 0.3.50 , < 1.30.1 (semver)

Date Public

2026-05-13 14:00

Credits

F5 acknowledges David Carlier, Zhenpeng (Leo) Lin of depthfirst, and GAO Liyou 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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CVE-2026-42946 (GCVE-0-2026-42946)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-05-13 16:06

Title

NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability

Summary

Severity

6.5 (Medium)


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

8.3 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 15:55 UTC

CWE

CWE-789 - Memory Allocation with Excessive Size Value
CWE-823 - Use of Out-of-range Pointer Offset

Assigner

f5 mitre root

References

1 reference

URL	Tags
https://my.f5.com/manage/s/article/K000161027	vendor-advisorypatch

Impacted products

2 products

Vendor	Product	Version
F5	NGINX Plus	Unaffected: R37 , < * (custom) Affected: R36 , < R36 P4 (custom) Affected: R32 , < R32 P6 (custom)
F5	NGINX Open Source	Unaffected: 1.31.0 , < * (semver) Affected: 0.8.42 , < 1.30.1 (semver)

Date Public

2026-05-13 14:00

Credits

F5 acknowledges Zhenpeng (Leo) Lin of depthfirst 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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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.

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.

Action not permitted

OESA-2026-2511 (CVE-2026-40701)

CVE-2026-40701 (GCVE-0-2026-40701)

CVE-2026-42934 (GCVE-0-2026-42934)

CVE-2026-42946 (GCVE-0-2026-42946)

Tags

Sightings

Nomenclature

Related by attack behaviour