DescriptionA read buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed the malicious certificate or for the application to continue certificate verification despite failure to construct a path to a trusted issuer. The read buffer overrun might result in a crash which could lead to a denial of service attack. In theory it could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext) although we are not aware of any working exploit leading to memory contents disclosure as of the time of release of this advisory. In a TLS client, this can be triggered by connecting to a malicious server. In a TLS server, this can be triggered if the server requests client authentication and a malicious client connects.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)jessie, jessie (lts)1.0.1t-1+deb8u21fixed
stretch (security)1.1.0l-1~deb9u6fixed
stretch (lts), stretch1.1.0l-1~deb9u9fixed
buster (security)1.1.1n-0+deb10u6fixed
bullseye (security)1.1.1n-0+deb11u5fixed
bookworm (security), bookworm3.0.11-1~deb12u2fixed
sid, trixie3.1.5-1fixed
openssl1.0 (PTS)stretch (security)1.0.2u-1~deb9u7fixed
stretch (lts), stretch1.0.2u-1~deb9u9fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsourcejessie(not affected)
opensslsourcestretch(not affected)
opensslsourcebuster(not affected)
opensslsourcebullseye(not affected)
openssl1.0source(unstable)(not affected)


[bullseye] - openssl <not-affected> (Only affects 3.x)
[buster] - openssl <not-affected> (Only affects 3.x);a=commit;h=c927a3492698c254637da836762f9b1f86cffabc (openssl-3.0.8)
[stretch] - openssl <not-affected> (Only affects 3.x)
[jessie] - openssl <not-affected> (Only affects 3.x)
- openssl1.0 <not-affected> (Only affects 3.x)

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