Bug 2500489

Summary: CVE-2026-15709 libsoup3: libsoup: WebSocket permessage-deflate Unbounded Decompression Remote Denial of Service [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: libsoup3Assignee: Adrian Vovk <avovk>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 45CC: avovk, gnome-sig, gwync, mcrha
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["b2b08115-f28a-4476-8990-1e0a1f70db1a"]}
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 01:12:15 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: 2499922    

Description Ganesh 2026-07-14 18:42:30 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 in libsoup’s `permessage-deflate` WebSocket extension allows a remote attacker to cause a Denial of Service via memory exhaustion. The internal `inflate()` loop resizes its buffer dynamically without enforcing an upper limit *during* decompression. Because size checks are either performed only on the compressed wire-payload or executed too late (after inflation completes), a small decompression bomb can trigger an immediate Out-of-Memory (OOM) crash on both client and server applications.

Comment 1 Aoife Moloney 2026-08-17 15:19:34 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 2026-09-04 00:25:36 UTC
Proposed upstream fix: https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/543

Comment 3 Fedora Update System 2026-09-05 20:54:41 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 20:54:57 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 20:55:12 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 00:56:52 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 01:07:36 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 01:26:51 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 01:12:15 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 01:14:21 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 00:18:29 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.