Public vulnerability disclosure

CVE-2026-0719

Libsoup: signed to unsigned conversion error leading to stack-based buffer overflow in libsoup ntlm authentication

publishedCWE-121

A flaw was identified in the NTLM authentication handling of the libsoup HTTP library, used by GNOME and other applications for network communication. When processing extremely long passwords, an internal size calculation can overflow due to improper use of signed integers. This results in incorrect memory allocation on the stack, followed by unsafe memory copying. As a result, applications using libsoup may crash unexpectedly, creating a denial-of-service risk.

Technical severity8.6 highCVSS 3.1 · CNA: redhat
Published2026-01-08Source updated 2026-11-04
Collected2026-11-042 attributed sources

Fixes and workarounds

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: CNA: redhat

Fix

RHSA-2026:2628: Red Hat Enterprise Linux Server (v. 7 ELS) RHSA-2026:2006: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) RHSA-2026:2182: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) RHSA-2026:2215: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8) RHSA-2026:2214: Red Hat Enterprise Linux AppStream (v. 8) RHSA-2026:2396: Red Hat Enterprise Linux AppStream AUS (v. 8.2), Red Hat Enterprise Linux BaseOS AUS (v. 8.2) RHSA-2026:2513: Red Hat Enterprise Linux AppStream AUS (v. 8.2) RHSA-2026:2402: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4), Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) RHSA-2026:2514: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) RHSA-2026:2512: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6), Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS E4S (v.8.6), Red Hat Enterprise Linux BaseOS TUS (v.8.6) RHSA-2026:2529: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6) RHSA-2026:1948: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8), Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8) RHSA-2026:2528: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) RHSA-2026:2008: Red Hat Enterprise Linux AppStream E4S (v.9.0) RHSA-2026:2005: Red Hat Enterprise Linux AppStream E4S (v.9.2) RHSA-2026:2007: Red Hat Enterprise Linux AppStream EUS (v.9.4) RHSA-2026:2049: Red Hat Enterprise Linux AppStream EUS (v.9.6) RHSA-2026:2216: Red Hat Enterprise Linux AppStream (v. 9) RHSA-2026:2844: Red Hat OpenShift Dev Spaces (RHOSDS) 3.26

Source: ADP: redhat-SADP

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: ADP: redhat-SADP

Affected products and versions

Affected products, source version ranges and reporting authorities
ProductVersionsAuthority
Red Hat Enterprise Linux 10
Red Hat
libsoup3
https://access.redhat.com/downloads/content/package-browser/
≥ 0:3.6.5-3.el10_1.9; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat
libsoup3
https://access.redhat.com/downloads/content/package-browser/
≥ 0:3.6.5-3.el10_0.14; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 7 Extended Lifecycle Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.2-11.el7_9; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-13.el8_10; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-1.el8_2.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_2.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_4.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_4.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_4.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_4.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_6.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_6.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_6.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_6.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_6.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_6.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-3.el8_8.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_8.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-3.el8_8.8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_8.1; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 9
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-12.el9_7.5; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-8.el9_0.9; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-8.el9_2.10; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 9.4 Extended Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-8.el9_4.9; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-10.el9_6.6; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat OpenShift Dev Spaces (RHOSDS) 3.26
Red Hat
devspaces/openvsx-rhel9
https://catalog.redhat.com/software/containers/
≥ 1770851052; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat OpenShift Dev Spaces (RHOSDS) 3.26
Red Hat
devspaces/pluginregistry-rhel9
https://catalog.redhat.com/software/containers/
≥ 1770918006; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat OpenShift Dev Spaces (RHOSDS) 3.26
Red Hat
devspaces/udi-rhel9
https://catalog.redhat.com/software/containers/
≥ 1770913862; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 6
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
Range not reported
Other versions: unknown
CNA: redhat
Red Hat Enterprise Linux 10
Red Hat
libsoup3
https://access.redhat.com/downloads/content/package-browser/
≥ 0:3.6.5-3.el10_1.9; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat
libsoup3
https://access.redhat.com/downloads/content/package-browser/
≥ 0:3.6.5-3.el10_0.14; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.2-11.el7_9; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-13.el8_10; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-1.el8_2.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_2.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_4.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_4.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_4.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_4.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_6.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_6.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_6.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_6.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-2.el8_6.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_6.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-3.el8_8.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_8.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.62.3-3.el8_8.8; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Red Hat
spice-client-win
https://access.redhat.com/downloads/content/package-browser/
≥ 0:8.10-7.el8_8.1; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 9
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-12.el9_7.5; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-8.el9_0.9; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-8.el9_2.10; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 9.4 Extended Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-8.el9_4.9; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 9.6 Extended Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
≥ 0:2.72.0-10.el9_6.6; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat OpenShift Dev Spaces (RHOSDS) 3.26
Red Hat
devspaces/openvsx-rhel9
https://catalog.redhat.com/software/containers/
≥ 1770851052; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat OpenShift Dev Spaces (RHOSDS) 3.26
Red Hat
devspaces/pluginregistry-rhel9
https://catalog.redhat.com/software/containers/
≥ 1770918006; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat OpenShift Dev Spaces (RHOSDS) 3.26
Red Hat
devspaces/udi-rhel9
https://catalog.redhat.com/software/containers/
≥ 1770913862; < * (unaffected, rpm)
Other versions: affected
ADP: redhat-SADP
Red Hat Enterprise Linux 6
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/
Range not reported
Other versions: unknown
ADP: redhat-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / scoreVectorAuthority
3.1 / 8.6
high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HCNA: redhat
3.1 / 8.6
high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HADP: redhat-SADP

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

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