CVE-2017-7961 — The cr_tknzr_parse_rgb function in cr-tknzr

The cr_tknzr_parse_rgb function in cr-tknzr.c in libcroco 0.6.11 and 0.6.12 has an "outside the range of representable values of type long" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have uns

01What is this vulnerability?

The cr_tknzr_parse_rgb function in cr-tknzr.c in libcroco 0.6.11 and 0.6.12 has an "outside the range of representable values of type long" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted CSS file. NOTE: third-party analysis reports "This is not a security issue in my view. The…

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: 2017-04-19T15:59:00.210
• Last modified: 2026-05-13T00:24:29.033

09References

• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00043.html
• openwall.com — http://openwall.com/lists/oss-security/2017/04/24/2
• blogs.gentoo.org — https://blogs.gentoo.org/ago/2017/04/17/libcroco-heap-overflow-and-undefined-beh…
• bugzilla.suse.com — https://bugzilla.suse.com/show_bug.cgi?id=1034482
• git.gnome.org — https://git.gnome.org/browse/libcroco/commit/?id=9ad72875e9f08e4c519ef63d44cdbd9…
• security.gentoo.org — https://security.gentoo.org/glsa/201707-13
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00043.html
• openwall.com — http://openwall.com/lists/oss-security/2017/04/24/2
• blogs.gentoo.org — https://blogs.gentoo.org/ago/2017/04/17/libcroco-heap-overflow-and-undefined-beh…
• bugzilla.suse.com — https://bugzilla.suse.com/show_bug.cgi?id=1034482