CVE-2017-5334 — Double free vulnerability in the gnutls_x509_ext_import_proxy function in GnuTLS

Double free vulnerability in the gnutls_x509_ext_import_proxy function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allows remote attackers to have unspecified impact via crafted policy language information in an X.509 certificate with a Proxy Certificate Information extension.

01What is this vulnerability?

Double free vulnerability in the gnutls_x509_ext_import_proxy function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allows remote attackers to have unspecified impact via crafted policy language information in an X.509 certificate with a Proxy Certificate Information extension.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-03-24T15:59:00.763
• Last modified: 2026-05-13T00:24:29.033

09References

• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2017-02/msg00005.html
• www.openwall.com — http://www.openwall.com/lists/oss-security/2017/01/10/7
• www.openwall.com — http://www.openwall.com/lists/oss-security/2017/01/11/4
• www.securityfocus.com — http://www.securityfocus.com/bid/95370
• www.securitytracker.com — http://www.securitytracker.com/id/1037576
• access.redhat.com — https://access.redhat.com/errata/RHSA-2017:2292
• gitlab.com — https://gitlab.com/gnutls/gnutls/commit/c5aaa488a3d6df712dc8dff23a049133cab5ec1b
• gnutls.org — https://gnutls.org/security.html#GNUTLS-SA-2017-1
• security.gentoo.org — https://security.gentoo.org/glsa/201702-04
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2017-02/msg00005.html