PatchTheCVECVE-2026-102560: A flaw was found in libsoup
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HIGH 8.6REMOTEWATCHLISTUPGRADEMITIGATE
CVE-2026-102560 is a high-severity flaw (CVSS 8.6) affecting libsoup, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A flaw was found in libsoup. When the permessage-deflate WebSocket extension compresses a very large outgoing message, truncated size calculations used for GByteArray growth could wrap, causing zlib to write past the allocated buffer and resulting in a heap buffer overflow.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.6 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 65%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-09-29 |
| Last modified | 2026-10-22 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
gnome libsoup UPGRADE
Affected: < 3.7.3
Fixed in: 3.7.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy libsoup || rpm -q libsoup || libsoup --version
2. UPGRADE to 3.7.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade libsoup
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade libsoup
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
redhat enterprise linux MITIGATE
Affected: 7.0 · 8.0 · 9.0 · 10.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Exact fixes by distribution
A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · python-fontconfig · FIXED · 0.6.3-1.fc46 · FEDORA-2026-f92ca8b01f · source
sudo dnf upgrade --advisory=FEDORA-2026-f92ca8b01f
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Ubuntu 20.04 · libsoup2.4 · NO FIX YET
Ubuntu 22.04 · libsoup2.4 · NO FIX YET
Ubuntu 24.04 · libsoup2.4 · NO FIX YET
Ubuntu 22.04 · libsoup3 · NO FIX YET
Ubuntu 24.04 · libsoup3 · NO FIX YET
Debian 12 · libsoup2.4 · NO FIX YET
Debian 13 · libsoup2.4 · NO FIX YET
Debian 12 · libsoup3 · NO FIX YET
Debian 13 · libsoup3 · NO FIX YET
RHEL 10 · libsoup3 · FIXED · libsoup3-3.6.5-3.el10_2.20
sudo dnf upgrade --advisory=RHSA-2026:83618
rpm -q libsoup3
RHEL 9 · libsoup · FIXED · libsoup-2.72.0-16.el9_8.8
sudo dnf upgrade --advisory=RHSA-2026:83384
rpm -q libsoup
RHEL 6 · libsoup · DEFERRED
RHEL 7 · libsoup · NOT AFFECTED
RHEL 8 · libsoup · NOT AFFECTED
sudo dnf update --advisory=ALAS2023-2026-3212
Advisories and coverage
Official advisories
- Amazon Linux 2023 ALAS: ALAS2023-2026-3212 (important): libsoup 2026-10-12
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.