Bug 2500953

Summary:	CVE-2026-15747 perl-Mojolicious: Mojolicious: Information disclosure via BREACH compression oracle [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Marian Rehak <mrehak>
Component:	perl-Mojolicious	Assignee:	Emmanuel Seyman <emmanuel>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	emmanuel, perl-devel, robinlee.sysu, yaneti
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["e36bc75e-1724-474d-9fb7-d241f546f9e3"]}
Fixed In Version:	perl-Mojolicious-9.48-1.fc44 perl-Mojolicious-9.48-1.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-28 01:00:48 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2500234

Description Marian Rehak 2026-07-15 14:17:23 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-07-19 07:21:54 UTC

FEDORA-2026-4334fd85bc (perl-Mojolicious-9.48-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-4334fd85bc

Comment 2 Fedora Update System 2026-07-19 07:21:55 UTC

FEDORA-2026-6f12b08313 (perl-Mojolicious-9.48-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-6f12b08313

Comment 3 Fedora Update System 2026-07-20 01:38:31 UTC

FEDORA-2026-4334fd85bc has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-4334fd85bc`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-4334fd85bc

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-07-20 01:55:39 UTC

FEDORA-2026-6f12b08313 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-6f12b08313`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-6f12b08313

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-07-28 01:00:48 UTC

FEDORA-2026-4334fd85bc (perl-Mojolicious-9.48-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-07-28 01:18:37 UTC

FEDORA-2026-6f12b08313 (perl-Mojolicious-9.48-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.