4.3

CVE-2026-91769: php_group php

CVSS: 4.3v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-91769DEBIAN-CVE-2026-91769
Published 25-09-2026Last modified 04-10-2026
Open JSON

Vulnerability summary

CVE-2026-91769 is a medium (CVSS 4.3) vulnerability in php_group php. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.6% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 6
MGASA-2026-0458OPENSUSE-SU-2026:11901-1OPENSUSE-SU-2026:22045-1RHSA-2026:70720SUSE-SU-2026:24158-1SUSE-SU-2026:4602-1

Timeline

  1. 25-09-2026
    PublishedVulnerability first disclosed.
  2. 04-10-2026
    Last modifiedVulnerability information updated.

Description

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN was still accepted when its CN matched the requested peer_name. A certificate trusted by the client for one name can therefore be used to impersonate another.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202619-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu7 products
  • php5All versions (No fix recorded)
  • php7.0All versions (No fix recorded)
  • php7.2All versions (No fix recorded)
  • php7.4All versions (No fix recorded)
  • php8.1All versions (No fix recorded)
Debian2 products
  • php8.2< 8.2.34-1~deb12u1
  • php8.4< 8.4.26-1~deb13u1 | < 8.4.26-1
Php_group1 product
  • php≥ 8.2.*, < 8.2.34 | ≥ 8.3.*, < 8.3.35 | ≥ 8.4.*, < 8.4.26 | ≥ 8.5.*, < 8.5.11

3 vendors · 10 products

References

6 links