CVE catalog

CVE-2025-40907

libfcgi-perl: CVE-2025-40907

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: May 16, 2025, 1:03:02 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.68% · Oct 25, 2026

FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. The included FastCGI library is affected by CVE-2025-23016, causing an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valueLen values in data to the IPC socket. This occurs in ReadParams in fcgiapp.c.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libfcgi-perl	sid	`0.82+ds-3`	fixed
Debian	libfcgi-perl	forky	`0.82+ds-3`	fixed
Debian	libfcgi-perl	trixie	`0.82+ds-3`	fixed
Debian	libfcgi-perl	bookworm	`0.82+ds-2`	fixed
Ubuntu	libfcgi-perl	pro	`0.78-2build1`	vulnerable
Ubuntu	libfcgi-perl	pro	`0.78-2ubuntu0.1~esm1`	fixed
Ubuntu	libfcgi-perl	20.04	`0.78-2build2`	vulnerable
Ubuntu	libfcgi-perl	20.04	`0.78-2build3`	vulnerable
Ubuntu	libfcgi-perl	20.04	`0.79-1`	vulnerable
Ubuntu	libfcgi-perl	20.04	`0.79-1ubuntu0.1`	fixed
Ubuntu	libfcgi-perl	pro	`0.78-2build1`	vulnerable
Ubuntu	libfcgi-perl	pro	`0.78-2ubuntu0.1~esm1`	fixed
Ubuntu	libfcgi-perl	20.04	`0.78-2build2`	vulnerable
Ubuntu	libfcgi-perl	20.04	`0.78-2build3`	vulnerable
Ubuntu	libfcgi-perl	20.04	`0.79-1`	vulnerable
Ubuntu	libfcgi-perl	20.04	`0.79-1ubuntu0.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libfcgi-perl	source	sid	`0.79+ds-2`	not yet assigned	Not reported	Not reported
Debian	libfcgi-perl	source	forky	`0.79+ds-2`	not yet assigned	Not reported	Not reported
Debian	libfcgi-perl	source	trixie	`0.79+ds-2`	not yet assigned	Not reported	Not reported
Debian	libfcgi-perl	source	bookworm	`0.79+ds-2`	not yet assigned	Not reported	Not reported
Ubuntu	libfcgi-perl	deb	pro	`0.78-2ubuntu0.1~esm1`	Not reported	USN-7527-1	Not reported
Ubuntu	libfcgi-perl	deb	20.04	`0.79-1ubuntu0.1`	Not reported	USN-7527-1	Not reported
Ubuntu	libfcgi-perl	deb	pro	`0.78-2ubuntu0.1~esm1`	Not reported	UBUNTU-CVE-2025-40907	Not reported
Ubuntu	libfcgi-perl	deb	20.04	`0.79-1ubuntu0.1`	Not reported	UBUNTU-CVE-2025-40907	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libfcgi-perl]Fixed
Details (2)
- 0.82+ds-2 · amd64 · bookworm
  Fixed · Fixed: 0.79+ds-2
  dsa · libfcgi-perl · debian · bookworm; dsa · libfcgi-perl · debian · 12
- 0.82+ds-2 · arm64 · bookworm
  Fixed · Fixed: 0.79+ds-2
  dsa · libfcgi-perl · debian · bookworm; dsa · libfcgi-perl · debian · 12

[Debian 13 (Trixie)]

[libfcgi-perl]Fixed
Source package: [libfcgi-perl]
Details (2)
- 0.82+ds-3+b2 · amd64 · trixie
  Fixed · Fixed: 0.79+ds-2
  dsa · libfcgi-perl · debian · 13
- 0.82+ds-3+b2 · arm64 · trixie
  Fixed · Fixed: 0.79+ds-2
  dsa · libfcgi-perl · debian · 13

Observed: Oct 24, 2026, 10:21:43 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]