CVE-2026-3099A flaw was found in Libsoup.
Updated under an hour ago ()
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It affects gnome libsoup and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
A flaw was found in Libsoup. The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user.
- CVSS
- 7.3 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-323
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
gnome libsoup gnome:libsoup | all versions | NVD |
redhat enterprise_linux redhat:enterprise_linux | 6.0; 7.0; 8.0; 9.0; 10.0 | NVD |
References
- https://access.redhat.com/security/cve/CVE-2026-3099third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2442232issue-tracking, third-party-advisory
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/495exploit, issue-tracking, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.