CVE catalog
CVE-2026-12478
The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket se
- Severity
- Medium · CVSS 4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.24% · Oct 25, 2026
The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libsoup3 | sid | 3.8.0-3 | fixed |
| Debian | libsoup3 | forky | 3.8.0-3 | fixed |
| Debian | libsoup3 | trixie | 3.6.5-3 | not affected |
| Debian | libsoup3 | bookworm | 3.2.3-0+deb12u2 | not affected |
| Debian | libsoup2.4 | trixie | 2.74.3-10.1 | not affected |
| Debian | libsoup2.4 | bookworm | 2.74.3-1+deb12u1 | not affected |
| Suse | libsoup | linux micro 6.2 | 3.6.6-160000.3.1 | fixed |
| Opensuse | libsoup | leap 16.0 | 3.6.6-160000.3.1 | fixed |
| Opensuse | libsoup | tumbleweed | 3.6.6-7.1 | fixed |
| Ubuntu | libsoup3 | pro | 3.0.4-2 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.4-3 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.5-1 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm1 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm2 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm3 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm4 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm5 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm6 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm7 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm8 | vulnerable |
| Ubuntu | libsoup3 | pro | 3.0.7-0ubuntu1+esm9 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.2-4 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-1 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-2 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-4 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5build1 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5build2 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.1 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.2 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.3 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.4 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.5 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.6 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.7 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.8 | vulnerable |
| Ubuntu | libsoup3 | 24.04 | 3.4.4-5ubuntu0.9 | vulnerable |
| Ubuntu | libsoup3 | 26.10 | 3.6.6-1 | vulnerable |
| Ubuntu | libsoup3 | 26.10 | 3.6.6-1ubuntu3 | vulnerable |
| Ubuntu | libsoup3 | 26.04 | 3.6.5-4 | vulnerable |
| Ubuntu | libsoup3 | 26.04 | 3.6.5-5 | vulnerable |
| Ubuntu | libsoup3 | 26.04 | 3.6.5-6 | vulnerable |
| Ubuntu | libsoup3 | 26.04 | 3.6.5-7 | vulnerable |
| Ubuntu | libsoup3 | 26.04 | 3.6.5-9 | vulnerable |
| Ubuntu | libsoup3 | 26.04 | 3.6.6-1 | vulnerable |
| Ubuntu | libsoup3 | 26.04 | 3.6.6-1ubuntu0.1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libsoup3 | source | sid | 3.8.0-1 | not yet assigned | Not reported | [1142836] |
| Debian | libsoup3 | source | forky | 3.8.0-1 | not yet assigned | Not reported | [1142836] |
| Debian | libsoup3 | source | trixie | Not affected | unimportant | Not reported | [1142836] |
| Debian | libsoup3 | source | bookworm | Not affected | unimportant | Not reported | [1142836] |
| Debian | libsoup2.4 | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | libsoup2.4 | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Suse | libsoup | rpm | linux micro 6.2 | 3.6.6-160000.3.1 | Not reported | SUSE-SU-2026:23800-1 | Not reported |
| Opensuse | libsoup | rpm | leap 16.0 | 3.6.6-160000.3.1 | Not reported | OPENSUSE-SU-2026:21871-1 | Not reported |
| Opensuse | libsoup | rpm | tumbleweed | 3.6.6-7.1 | Not reported | OPENSUSE-SU-2026:11316-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [libsoup-3_0-0]Unknown
Source package: [libsoup]
Details (1)
3.6.6-8.1· x86_64 · tumbleweedUnknown · Fixed:
3.6.6-7.1Version impact unknown
nvd · libsoup · opensuse · tumbleweed
- [libsoup-3_0-0-32bit]Unknown
Source package: [libsoup]
Details (1)
3.6.6-8.1· x86_64 · tumbleweedUnknown · Fixed:
3.6.6-7.1Version impact unknown
nvd · libsoup · opensuse · tumbleweed
- [libsoup-devel]Unknown
Source package: [libsoup]
Details (1)
3.6.6-8.1· x86_64 · tumbleweedUnknown · Fixed:
3.6.6-7.1Version impact unknown
nvd · libsoup · opensuse · tumbleweed
- [libsoup-devel-32bit]Unknown
Source package: [libsoup]
Details (1)
3.6.6-8.1· x86_64 · tumbleweedUnknown · Fixed:
3.6.6-7.1Version impact unknown
nvd · libsoup · opensuse · tumbleweed
- [libsoup-lang]Unknown
Source package: [libsoup]
Details (1)
3.6.6-8.1· noarch · tumbleweedUnknown · Fixed:
3.6.6-7.1Version impact unknown
nvd · libsoup · opensuse · tumbleweed
- [libsoup-tests]Unknown
Source package: [libsoup]
Details (1)
3.6.6-8.1· x86_64 · tumbleweedUnknown · Fixed:
3.6.6-7.1Version impact unknown
nvd · libsoup · opensuse · tumbleweed
- [typelib-1_0-Soup-3_0]Unknown
Source package: [libsoup]
Details (1)
3.6.6-8.1· x86_64 · tumbleweedUnknown · Fixed:
3.6.6-7.1Version impact unknown
nvd · libsoup · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [gir1.2-soup-2.4]Not affected
Source package: [libsoup2.4]
Details (2)
2.74.3-1+deb12u1· amd64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
2.74.3-1+deb12u1· arm64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
- [gir1.2-soup-3.0]Not affected
Source package: [libsoup3]
Details (2)
3.2.3-0+deb12u2· amd64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
3.2.3-0+deb12u2· arm64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
- [libsoup2.4-1]Not affected
Source package: [libsoup2.4]
Details (2)
2.74.3-1+deb12u1· amd64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
2.74.3-1+deb12u1· arm64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
- [libsoup2.4-common]Not affected
Source package: [libsoup2.4]
Details (2)
2.74.3-1+deb12u1· all · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
2.74.3-1+deb12u1· all · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
- [libsoup2.4-dev]Not affected
Source package: [libsoup2.4]
Details (2)
2.74.3-1+deb12u1· amd64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
2.74.3-1+deb12u1· arm64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
- [libsoup2.4-doc]Not affected
Source package: [libsoup2.4]
Details (2)
2.74.3-1+deb12u1· all · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
2.74.3-1+deb12u1· all · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
- [libsoup2.4-tests]Not affected
Source package: [libsoup2.4]
Details (2)
2.74.3-1+deb12u1· amd64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
2.74.3-1+deb12u1· arm64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
- [libsoup-3.0-0]Not affected
Source package: [libsoup3]
Details (2)
3.2.3-0+deb12u2· amd64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
3.2.3-0+deb12u2· arm64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
- [libsoup-3.0-common]Not affected
Source package: [libsoup3]
Details (2)
3.2.3-0+deb12u2· all · bookwormNot affected
nvd · libsoup3 · debian · bookworm
3.2.3-0+deb12u2· all · bookwormNot affected
nvd · libsoup3 · debian · bookworm
- [libsoup-3.0-dev]Not affected
Source package: [libsoup3]
Details (2)
3.2.3-0+deb12u2· amd64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
3.2.3-0+deb12u2· arm64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
- [libsoup-3.0-doc]Not affected
Source package: [libsoup3]
Details (2)
3.2.3-0+deb12u2· all · bookwormNot affected
nvd · libsoup3 · debian · bookworm
3.2.3-0+deb12u2· all · bookwormNot affected
nvd · libsoup3 · debian · bookworm
- [libsoup-3.0-tests]Not affected
Source package: [libsoup3]
Details (2)
3.2.3-0+deb12u2· amd64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
3.2.3-0+deb12u2· arm64 · bookwormNot affected
nvd · libsoup3 · debian · bookworm
- [libsoup-gnome2.4-1]Not affected
Source package: [libsoup2.4]
Details (2)
2.74.3-1+deb12u1· amd64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
2.74.3-1+deb12u1· arm64 · bookwormNot affected
nvd · libsoup2.4 · debian · bookworm
Observed:
References
- [https://access.redhat.com/security/cve/CVE-2026-12478]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2489655]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_23800-1.json]
- [https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-12478]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-12478]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23800-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-12478]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11316-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21871-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-12478]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12478.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]