PHP CVE-2026-91767: Heap buffer overflow in php_openssl_matches_wildcard_name() on crafted server certificate wildcard CN

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

not scored

EPSS

• CVE-2026-91767: 0.11% estimated exploitation activity in the next 30 days; percentile 1.15 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

php.net's PHP 8 ChangeLog lists CVE-2026-91767 as fixed in PHP 8.2.34, 8.3.35, 8.4.26 and 8.5.11. Partial ranges: only these branches are listed, so other PHP versions are unknown (not confirmed unaffected) until NVD publishes product data. Fixed GHSA-xr7j-rvgx-xq5p (Heap buffer overflow in php_openssl_matches_wildcard_name() on crafted server certificate wildcard CN). (CVE-2026-91767)

Published by the source

24 Sep 2026, 00:00 UTC

Last modified by the source

29 Oct 2026, 10:45 UTC

Source last checked

30 Oct 2026, 07:30 UTC

1. Revision 4 · amended · 30 Oct 2026

   Amended from osv record BIT-libphp-2026-91767

2. Revision 3 · amended · 30 Oct 2026

   Amended from osv record BIT-php-2026-91767

3. Revision 2 · amended · 30 Oct 2026

   Amended from osv record BIT-php-min-2026-91767

4. Revision 1 · created · 26 Oct 2026

   Published from vendor_advisory record php-changelog-8:CVE-2026-91767

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# Patch Next advisory brief: CVE-2026-91767

Advisory: PHP CVE-2026-91767: Heap buffer overflow in php_openssl_matches_wildcard_name() on crafted server certificate wildcard CN
IDs: CVE-2026-91767
Record: https://patchnext.com/advisories/cve-2026-91767 (revision 4, source checked 30 Oct 2026, 07:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: php 8.5.11, 8.4.26, 8.3.35, 8.2.34; libphp 8.5.11, 8.4.26, 8.3.35, 8.2.34; php-min 8.5.11, 8.4.26, 8.3.35, 8.2.34; php 8.5.11, 8.4.26, 8.3.35, 8.2.34. A vendor fix does not mean a deployment is fixed.

## Affected components
- Bitnami php: affected >= 8.2.0, < 8.2.34; >= 8.3.0, < 8.3.35; >= 8.4.0, < 8.4.26; >= 8.5.0, < 8.5.11; fixed in 8.3.35, 8.5.11, 8.4.26, 8.2.34
- Bitnami libphp: affected >= 8.2.0, < 8.2.34; >= 8.3.0, < 8.3.35; >= 8.4.0, < 8.4.26; >= 8.5.0, < 8.5.11; fixed in 8.3.35, 8.5.11, 8.4.26, 8.2.34
- Bitnami php-min: affected >= 8.2.0, < 8.2.34; >= 8.3.0, < 8.3.35; >= 8.4.0, < 8.4.26; >= 8.5.0, < 8.5.11; fixed in 8.3.35, 8.5.11, 8.4.26, 8.2.34
- runtime php: affected >= 8.2.0, < 8.2.34; >= 8.3.0, < 8.3.35; >= 8.4.0, < 8.4.26; >= 8.5.0, < 8.5.11; fixed in 8.3.35, 8.5.11, 8.4.26, 8.2.34

## Suggested inspection (read-only)
- Bitnami php: check the installed version with your package manager.
- Bitnami libphp: check the installed version with your package manager.
- Bitnami php-min: check the installed version with your package manager.
- runtime php: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on php, libphp, php-min.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://www.php.net/ChangeLog-8.php (php.net's PHP 8 ChangeLog lists CVE-2026-91767 as fixed in PHP 8.2.34, 8.3.35, 8.4.26 and 8.5.11 (released 2026-09-24).)
- Verified: https://osv.dev/vulnerability/BIT-php-min-2026-91767 (OSV record BIT-php-min-2026-91767 lists affected ranges: Bitnami php-min >=8.2.0 =8.3.0 =8.4.0 =8.5.0 <8.5.11 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-php-2026-91767 (OSV record BIT-php-2026-91767 lists affected ranges: Bitnami php >=8.2.0 =8.3.0 =8.4.0 =8.5.0 <8.5.11 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-libphp-2026-91767 (OSV record BIT-libphp-2026-91767 lists affected ranges: Bitnami libphp >=8.2.0 =8.3.0 =8.4.0 =8.5.0 <8.5.11 (fixed))

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