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Fencer Vulns
high 7.5

CVE-2023-52892 json

Name confusion in x509 Subject Alternative Name fields

published 2024-06-27 2 y ago modified 2026-06-17 4 mo ago also GHSA-ff7q-6vwh-v9m4 , EUVD-2024-2038

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

In phpseclib before 1.0.22, 2.x before 2.0.46, and 3.x before 3.0.33, some characters in Subject Alternative Name fields in TLS certificates are incorrectly allowed to have a special meaning in regular expressions (such as a + wildcard), leading to name confusion in X.509 certificate host verification.

Patch / fix

  • packagist phpseclib/phpseclib 1.0.22, 2.0.46, 3.0.33
  • phpseclib phpseclib 1.0.22, 2.0.46, 3.0.33
  • phpseclib Debian 12 1.0.20-1+deb12u3
  • phpseclib Debian 13 1.0.22-1
  • php-phpseclib Debian 12 2.0.42-1+deb12u3
  • php-phpseclib Debian 14, Debian 13 2.0.46-1
  • php-phpseclib3 Debian 12 3.0.19-1+deb12u4
  • php-phpseclib3 Debian 14, Debian 13 3.0.33-1

debian advisories DEBIAN-CVE-2023-52892

  • phpseclib Ubuntu 22.04 LTS 1.0.20-1+deb12u3build0.22.04.1
  • phpseclib Ubuntu Pro 16.04 LTS 1.0.1-3ubuntu0.1+esm1
  • phpseclib Ubuntu Pro 18.04 LTS 1.0.9-1ubuntu0.1~esm1
  • phpseclib Ubuntu Pro 20.04 LTS 1.0.18-2ubuntu0.1~esm1
  • phpseclib Ubuntu Pro 22.04 LTS 1.0.20-1ubuntu0.1~esm1
  • php-phpseclib Ubuntu Pro 16.04 LTS 2.0.1-1ubuntu0.1~esm2
  • php-phpseclib Ubuntu Pro 18.04 LTS 2.0.9-1ubuntu0.1~esm2
  • php-phpseclib Ubuntu Pro 20.04 LTS 2.0.23-2ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2023-52892

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-52892 updated

php-seclib: Incorrect allowed input via Subject Alternative Name fields

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/phpseclib/phpseclib/issues/1943 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist phpseclib/phpseclib
<1.0.22
>=2.0.0, <2.0.46
>=3.0.0, <3.0.33
1.0.22
2.0.46
3.0.33

Affected products

  • phpseclib phpseclib

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.