CVE-2025-9232

NameCVE-2025-9232
DescriptionIssue summary: An application using the OpenSSL HTTP client API functions may trigger an out-of-bounds read if the 'no_proxy' environment variable is set and the host portion of the authority component of the HTTP URL is an IPv6 address. Impact summary: An out-of-bounds read can trigger a crash which leads to Denial of Service for an application. The OpenSSL HTTP client API functions can be used directly by applications but they are also used by the OCSP client functions and CMP (Certificate Management Protocol) client implementation in OpenSSL. However the URLs used by these implementations are unlikely to be controlled by an attacker. In this vulnerable code the out of bounds read can only trigger a crash. Furthermore the vulnerability requires an attacker-controlled URL to be passed from an application to the OpenSSL function and the user has to have a 'no_proxy' environment variable set. For the aforementioned reasons the issue was assessed as Low severity. The vulnerable code was introduced in the following patch releases: 3.0.16, 3.1.8, 3.2.4, 3.3.3, 3.4.0 and 3.5.0. The FIPS modules in 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected by this issue, as the HTTP client implementation is outside the OpenSSL FIPS module boundary.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-6015-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)bullseye1.1.1w-0+deb11u1fixed
bullseye (security)1.1.1w-0+deb11u4fixed
bookworm3.0.17-1~deb12u2vulnerable
bookworm (security)3.0.17-1~deb12u3fixed
trixie3.5.1-1vulnerable
trixie (security)3.5.1-1+deb13u1fixed
forky, sid3.5.4-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsourcebullseye(not affected)
opensslsourcebookworm3.0.17-1~deb12u3DSA-6015-1
opensslsourcetrixie3.5.1-1+deb13u1DSA-6015-1
opensslsource(unstable)3.5.4-1

Notes

[bullseye] - openssl <not-affected> (Vulnerable code not present)
https://openssl-library.org/news/secadv/20250930.txt

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