Description
A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | libsoup3 +1 | No fix yet | — |
| Debian 12 | libsoup3 +1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libsoup2.4 | No fix yet | — |
| Ubuntu 26.10 | libsoup3 | 3.6.6-1ubuntu3.1 | USN-8975-1 |
| Ubuntu 26.04 LTS | libsoup3 | 3.6.6-1ubuntu0.2 | USN-8975-1 |
| Ubuntu 24.04 LTS | libsoup2.4 | 2.74.3-6ubuntu1.10 | USN-8975-1 |
| Ubuntu 24.04 LTS | libsoup3 | 3.4.4-5ubuntu0.10 | USN-8975-1 |
| Ubuntu 22.04 LTS | libsoup2.4 | 2.74.2-3ubuntu0.10 | USN-8975-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | libsoup2.4 | 2.74.3-10.1ubuntu5+esm4 | USN-8975-1 |
| Ubuntu Pro 22.04 LTS | libsoup3 | 3.0.7-0ubuntu1+esm10 | USN-8975-1 |
| Ubuntu Pro 20.04 LTS | libsoup2.4 | 2.70.0-1ubuntu0.5+esm5 | USN-8975-1 |
| Ubuntu Pro 18.04 LTS | libsoup2.4 | 2.62.1-1ubuntu0.4+esm10 | USN-8975-1 |
| Ubuntu Pro 16.04 LTS | libsoup2.4 | 2.52.2-1ubuntu0.3+esm9 | USN-8975-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libsoup3 +2 | 3.6.5-3.el10_2.20 | RHSA-2026:98560, RHSA-2026:83618 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | libsoup3 +2 | 3.6.5-3.el10_0.19 | RHSA-2026:93583 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libsoup3 +2 | 3.6.5-3.el10_2.20 | ALSA-2026:83618 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libsoup3 +2 | 3.6.6-1.el10_3.9 | RLSA-2026:98560 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libsoup | 3.4.4-150600.3.59.1 | SUSE-SU-2026:4631-1 |
| SLES 15 SP6 | libsoup | 3.4.4-150600.3.59.1 | SUSE-SU-2026:4631-1 |
| SLES 15 SP5 | libsoup | 3.0.4-150400.3.55.1 | SUSE-SU-2026:4616-1 |
| SLES 15 SP4 | libsoup | 3.0.4-150400.3.55.1 | SUSE-SU-2026:4616-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libsoup | 3.6.6-160000.5.1 | SUSE-SU-2026:24470-1 |
| SLES for SAP 15 SP6 | libsoup | 3.4.4-150600.3.59.1 | SUSE-SU-2026:4631-1 |
| SLES for SAP 15 SP5 | libsoup | 3.0.4-150400.3.55.1 | SUSE-SU-2026:4616-1 |
| SLES for SAP 15 SP4 | libsoup | 3.0.4-150400.3.55.1 | SUSE-SU-2026:4616-1 |
| SLES 16.0 | libsoup | 3.6.6-160000.5.1 | SUSE-SU-2026:24470-1 |
| SLE Micro 6.0 | libsoup | 3.4.2-159998.1.1 | SUSE-SU-2026:24368-1 |
| SLE HPC 15 SP5 | libsoup | 3.0.4-150400.3.55.1 | SUSE-SU-2026:4616-1 |
| SLE HPC 15 SP4 | libsoup | 3.0.4-150400.3.55.1 | SUSE-SU-2026:4616-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | libsoup | 3.6.6-160000.5.1 | openSUSE-SU-2026:22181-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libsoup3 +2 | 3.7.3-1.amzn2023 | ALAS2023-2026-3421 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libsoup | 3.4.4-18 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libsoup3 +2 | 3.6.5-3.el10_2.20 | ELSA-2026-83618 |
Advisories 13
- RHSA-2026:98560 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:93583 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:98560 Important: libsoup3 security update Rocky Linux Security Advisories · Nov 13, 2026
- ALAS2023-2026-3421 Important: libsoup3 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 12, 2026
- SUSE-SU-2026:24470-1 Security update for libsoup SUSE / openSUSE Security Updates · Nov 4, 2026
- USN-8975-1 libsoup2.4, libsoup3 vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- openSUSE-SU-2026:22181-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 31, 2026
- ALSA-2026:83618 Important: libsoup3 security update AlmaLinux Security Advisories · Oct 29, 2026
- SUSE-SU-2026:24368-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 27, 2026
- RHSA-2026:83618 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- ELSA-2026-83618 Important: libsoup3 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 15, 2026
- SUSE-SU-2026:4631-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 13, 2026
- SUSE-SU-2026:4616-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 13, 2026
References
- RHSA-2026:83618 vendor-advisory
- RHSA-2026:93583 vendor-advisory
- RHSA-2026:98560 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-102555 vdb-entry
- RHBZ#2543224 issue-tracking