Bug 2500132

Summary:	CVE-2026-15712 libsoup3: libsoup: HTTP/2 GOAWAY frame parsing heap buffer over-read via invalid NUL-termination assumption [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Ganesh <gnaik>
Component:	libsoup3	Assignee:	Adrian Vovk <avovk>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	45	CC:	avovk, gnome-sig, gwync, mcrha
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["649d0650-cde9-4ecb-8f1c-d4270be604a7"]}
Fixed In Version:	libsoup3-3.6.6-10.fc44 libsoup3-3.6.6-5.fc43 libsoup3-3.7.2-2.fc45	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-09-08 01:12:12 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:	2499939

Description Ganesh 2026-07-14 18:04:19 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.

A flaw was found in libsoup's HTTP/2 protocol parsing logic where processing malformed network frames can trigger a heap buffer over-read condition.

Component / Vulnerable Part:

libsoup -> HTTP/2 connection processing backend (soup-client-message-io-http2.c or similar HTTP/2 state engine components handling GOAWAY frames).

Technical Analysis & Root Cause:

When an HTTP/2 session receives a GOAWAY frame, the frame can contain an optional "Additional Debug Data" payload field. The libsoup library erroneously treats this debug data block as a standard, safely NUL-terminated C-string without explicitly verifying the payload length boundaries provided by the framing layer. If a remote peer constructs a malicious GOAWAY frame containing a debug string that lacks a terminating \0 byte within the bounds of the frame allocation, internal string functions will read past the allocated heap space looking for the delimiter.

Impact:

A remote attacker acting as a malicious HTTP/2 endpoint can transmit a specially crafted GOAWAY frame to read out-of-bounds heap memory. This results in an immediate application crash (Denial of Service) or potential information disclosure of adjacent memory metadata.

Comment 1 Aoife Moloney 2026-08-17 15:19:27 UTC

This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 2 Adrian Vovk 2026-09-03 22:26:42 UTC

Potential upstream fix: https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/548

Comment 3 Fedora Update System 2026-09-05 20:54:38 UTC

FEDORA-2026-3f60ccf61f (libsoup3-3.6.6-10.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f60ccf61f

Comment 4 Fedora Update System 2026-09-05 20:54:41 UTC

FEDORA-2026-ce24b84bb1 (libsoup3-3.7.2-2.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ce24b84bb1

Comment 5 Fedora Update System 2026-09-05 20:54:44 UTC

FEDORA-2026-fce2f41203 (libsoup3-3.6.6-5.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-fce2f41203

Comment 6 Fedora Update System 2026-09-06 00:56:50 UTC

FEDORA-2026-3f60ccf61f 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-2026-3f60ccf61f`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f60ccf61f

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

Comment 7 Fedora Update System 2026-09-06 01:07:33 UTC

FEDORA-2026-ce24b84bb1 has been pushed to the Fedora 45 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-ce24b84bb1`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ce24b84bb1

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

Comment 8 Fedora Update System 2026-09-06 01:26:48 UTC

FEDORA-2026-fce2f41203 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-fce2f41203`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-fce2f41203

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

Comment 9 Fedora Update System 2026-09-08 01:12:12 UTC

FEDORA-2026-3f60ccf61f (libsoup3-3.6.6-10.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 10 Fedora Update System 2026-09-10 01:14:18 UTC

FEDORA-2026-fce2f41203 (libsoup3-3.6.6-5.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 11 Fedora Update System 2026-09-12 00:18:26 UTC

FEDORA-2026-ce24b84bb1 (libsoup3-3.7.2-2.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.