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Vulnerability · Published Jul 14, 2026 · Assigned by redhat

CVE-2026-15712Soupclientmessageiohttp2: libsoup3: libsoup: http/2 goaway frame parsing heap buffer over-read via invalid nul-termination assumption

Medium 5.9

In plain English

A medium-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.6%top 49.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A heap buffer over-read vulnerability was discovered in libsoup's (versions: libsoup 3.0 to 3.7.0) HTTP/2 connection tracking framework. When the library processes an HTTP/2 GOAWAY frame, it improperly handles the "Additional Debug Data" payload by assuming the data stream is a safely NUL-terminated C-string. Because the parser lacks strict length-boundary verification before reading this data, a remote, unauthenticated attacker can intentionally send a malformed GOAWAY frame missing the appropriate null delimiter. This causes the library to read past the end of the allocated buffer, triggering an application crash that results in a denial of service (DoS), or potentially exposing fragments of memory contents.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libsoup3no fix listedDEBIAN-CVE-2026-15712
Debian:13libsoup3no fix listedDEBIAN-CVE-2026-15712
Ubuntu:24.04:LTSlibsoup3no fix listedUBUNTU-CVE-2026-15712
Ubuntu:26.04:LTSlibsoup3no fix listedUBUNTU-CVE-2026-15712
Ubuntu:26.10libsoup3no fix listedUBUNTU-CVE-2026-15712

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References