CVE-2026-45305

EUVD-2026-44359
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Yaml\Parser::cleanup() used regular expressions with overlapping quantifiers for YAML directive, comment, and document marker cleanup, allowing crafted input to make parsing hang for an arbitrarily long time. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 49.83%
Affected Products (NVD)
VendorProductVersion
sensiolabssymfony
𝑥
< 5.4.52
sensiolabssymfony
6.0.0 ≤
𝑥
< 6.4.40
sensiolabssymfony
7.0.0 ≤
𝑥
< 7.4.12
sensiolabssymfony
8.0.0 ≤
𝑥
< 8.0.12
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
symfony
bookworm
5.4.53+dfsg-0+deb12u1
fixed
bookworm (security)
5.4.53+dfsg-0+deb12u1
fixed
bullseye
vulnerable
bullseye (security)
vulnerable
forky
7.4.16+dfsg-1
fixed
sid
7.4.17+dfsg-1
fixed
trixie
6.4.41+dfsg-0+deb13u1
fixed
trixie (security)
6.4.41+dfsg-0+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
symfony
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/symfony/symfony/commit/9749cd43c5e09b3735093623670b21b9d8a056cb
https://github.com/symfony/symfony/releases/tag/v5.4.52
https://github.com/symfony/symfony/releases/tag/v6.4.40
https://github.com/symfony/symfony/releases/tag/v7.4.12
https://github.com/symfony/symfony/releases/tag/v8.0.12
https://github.com/symfony/symfony/security/advisories/GHSA-9frc-8383-795m