Libsoup: signed to unsigned conversion error leading to stack-based buffer overflow in libsoup ntlm authentication
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- libsoup3
Version range not reported
- libsoup3
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- libsoup
Version range not reported
- spice-client-win
Version range not reported
- libsoup
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- libsoup
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- libsoup
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- spice-client-win
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- libsoup
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- spice-client-win
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- libsoup
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- spice-client-win
Version range not reported
- libsoup
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- spice-client-win
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- libsoup
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- spice-client-win
Version range not reported
- libsoup
Version range not reported
- spice-client-win
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- libsoup
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- spice-client-win
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- libsoup
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- spice-client-win
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- libsoup
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- libsoup
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- libsoup
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- libsoup
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- libsoup
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- devspaces/openvsx-rhel9
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- devspaces/pluginregistry-rhel9
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- devspaces/udi-rhel9
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- libsoup
Version range not reported
References 22
access.redhat.com
- errata/RHSA-2026:1948
- errata/RHSA-2026:2005
- errata/RHSA-2026:2006
- errata/RHSA-2026:2007
- errata/RHSA-2026:2008
- errata/RHSA-2026:2049
- errata/RHSA-2026:2182
- errata/RHSA-2026:2214
- errata/RHSA-2026:2215
- errata/RHSA-2026:2216
- errata/RHSA-2026:2396
- errata/RHSA-2026:2402
- errata/RHSA-2026:2512
- errata/RHSA-2026:2513
- errata/RHSA-2026:2514
- errata/RHSA-2026:2528
- errata/RHSA-2026:2529
- errata/RHSA-2026:2628
- errata/RHSA-2026:2844
- security/cve/CVE-2026-0719