CVE catalog

CVE-2026-15747

Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle. _csrf_token generates and caches one token per session and

[CVE catalog]

Severity: Critical · CVSS 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Jul 14, 2026, 5:07:32 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.25% · Oct 25, 2026

Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle. _csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden `csrf_token` input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle. An attacker able to query it can recover the token and pass csrf_protect validation.

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	libmojolicious-perl	sid	`9.53+dfsg-1`	fixed
Debian	libmojolicious-perl	forky	`9.49+dfsg-1`	fixed
Debian	libmojolicious-perl	trixie	`9.39+dfsg-1`	vulnerable
Debian	libmojolicious-perl	bookworm	`9.31+dfsg-1`	vulnerable
Cpe	libmojolicious-perl	Not reported	Not reported	vulnerable
Suse	perl-Mojolicious	linux enterprise module for package hub 15 sp7	`9.370.0-150700.3.3.1`	fixed
Opensuse	perl-Mojolicious	leap 16.0	`9.480.0-bp160.1.1`	fixed
Opensuse	perl-Mojolicious	tumbleweed	`9.480.0-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libmojolicious-perl	source	sid	`9.48+dfsg-1`	not yet assigned	Not reported	Not reported
Debian	libmojolicious-perl	source	forky	`9.48+dfsg-1`	not yet assigned	Not reported	Not reported
Debian	libmojolicious-perl	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	libmojolicious-perl	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Suse	perl-Mojolicious	rpm	linux enterprise module for package hub 15 sp7	`9.370.0-150700.3.3.1`	Not reported	SUSE-SU-2026:4151-1	Not reported
Opensuse	perl-Mojolicious	rpm	leap 16.0	`9.480.0-bp160.1.1`	Not reported	OPENSUSE-SU-2026:21496-1	Not reported
Opensuse	perl-Mojolicious	rpm	tumbleweed	`9.480.0-1.1`	Not reported	OPENSUSE-SU-2026:11282-1	Not reported

Notes

[trixie] libmojolicious-perl: Minor issue [bookworm] libmojolicious-perl: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libmojolicious-perl]Affected
Details (4)
- 9.31+dfsg-1 · all · bookworm
  Affected
  nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12
- 9.31+dfsg-1 · all · bookworm
  Affected
  nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12
- 9.37+dfsg-2~bpo12+1 · all · bookworm-backports
  Affected
  nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12
- 9.37+dfsg-2~bpo12+1 · all · bookworm-backports
  Affected
  nvd · libmojolicious-perl · debian · bookworm; nvd · libmojolicious-perl · debian · 12

[Debian 13 (Trixie)]

[libmojolicious-perl]Affected
Details (4)
- 9.39+dfsg-1 · all · trixie
  Affected
  nvd · libmojolicious-perl · debian · 13
- 9.39+dfsg-1 · all · trixie
  Affected
  nvd · libmojolicious-perl · debian · 13
- 9.42+dfsg-1~bpo13+2 · all · trixie-backports
  Affected
  nvd · libmojolicious-perl · debian · 13
- 9.42+dfsg-1~bpo13+2 · all · trixie-backports
  Affected
  nvd · libmojolicious-perl · debian · 13

[openSUSE Tumbleweed]

[perl-Mojolicious]Fixed
Source package: [perl-Mojolicious]
Details (1)
- 9.490.0-1.1 · noarch · tumbleweed
  Fixed · Fixed: 9.480.0-1.1
  nvd · perl-Mojolicious · opensuse · tumbleweed

Observed: Oct 25, 2026, 10:24:55 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]