Vulnerability · Published Sep 29, 2026 · Assigned by redhat
CVE-2026-102560Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth
High 8.6
In plain English
A high-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.5%top 55.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:9 | libsoup | 2.72.0-16.el9_8.8 | ALSA-2026:83384 |
| AlmaLinux:9 | libsoup-devel | 2.72.0-16.el9_8.8 | ALSA-2026:83384 |
| AlmaLinux:10 | libsoup3 | 3.6.5-3.el10_2.20 | ALSA-2026:83618 |
| AlmaLinux:10 | libsoup3-devel | 3.6.5-3.el10_2.20 | ALSA-2026:83618 |
| AlmaLinux:10 | libsoup3-doc | 3.6.5-3.el10_2.20 | ALSA-2026:83618 |
| Debian:12 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-102560 |
| Debian:13 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-102560 |
| Debian:12 | libsoup3 | no fix listed | DEBIAN-CVE-2026-102560 |
| Debian:13 | libsoup3 | no fix listed | DEBIAN-CVE-2026-102560 |
| Rocky Linux:9 | libsoup | 0:2.72.0-16.el9_8.8 | RLSA-2026:83384 |
| Ubuntu:22.04:LTS | libsoup2.4 | 2.74.2-3ubuntu0.10 | UBUNTU-CVE-2026-102560 |
| Ubuntu:22.04:LTS | libsoup2.4 | 2.74.2-3ubuntu0.10 | USN-8975-1 |
| Ubuntu:24.04:LTS | libsoup2.4 | 2.74.3-6ubuntu1.10 | USN-8975-1 |
| Ubuntu:24.04:LTS | libsoup2.4 | 2.74.3-6ubuntu1.10 | UBUNTU-CVE-2026-102560 |
| Ubuntu:26.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-102560 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.10 | USN-8975-1 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.10 | UBUNTU-CVE-2026-102560 |
| Ubuntu:26.04:LTS | libsoup3 | 3.6.6-1ubuntu0.2 | UBUNTU-CVE-2026-102560 |
| Ubuntu:26.04:LTS | libsoup3 | 3.6.6-1ubuntu0.2 | USN-8975-1 |
| Ubuntu:26.10 | libsoup3 | 3.6.6-1ubuntu3.1 | UBUNTU-CVE-2026-102560 |
| Ubuntu:26.10 | libsoup3 | 3.6.6-1ubuntu3.1 | USN-8975-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | see references |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | see references |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
References
- RHSA-2026:83384 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:83618 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:93445 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:93446 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:93447 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:93583 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-102560 vdb-entry, x_refsource_REDHAT
- RHBZ#2543296 issue-tracking, x_refsource_REDHAT