CVE-2018-6196 — w3m through 0

w3m through 0.5.3 is prone to an infinite recursion flaw in HTMLlineproc0 because the feed_table_block_tag function in table.c does not prevent a negative indent value.

01What is this vulnerability?

w3m through 0.5.3 is prone to an infinite recursion flaw in HTMLlineproc0 because the feed_table_block_tag function in table.c does not prevent a negative indent value.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

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: 2018-01-25T03:00:00.000Z
• Last modified: 2024-08-05T05:54:53.170Z

09References

• github.com — https://github.com/tats/w3m/commit/8354763b90490d4105695df52674d0fcef823e92
• usn.ubuntu.com — https://usn.ubuntu.com/3555-2/
• github.com — https://github.com/tats/w3m/issues/88
• usn.ubuntu.com — https://usn.ubuntu.com/3555-1/
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00028.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/04/msg00025.html