6.5

CVE-2026-91768: php_group php

CVSS: 6.5v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-91768DEBIAN-CVE-2026-91768
Published 25-09-2026Last modified 28-09-2026
Open JSON

Vulnerability summary

CVE-2026-91768 is a medium (CVSS 6.5) vulnerability in php_group php. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.5% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.56%
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. 28-09-2026
    Last modifiedVulnerability information updated.

Description

The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.56%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202619-10-2026
EPSS score
0.56%

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