What is CVE-2021-26259?

CVE-2021-26259 is a high-severity vulnerability in Htmldoc Project, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-03-03.

How severe is CVE-2021-26259?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Htmldoc Project

CVE-2021-26259

A flaw was found in htmldoc in v1.9.12. Heap buffer overflow in render_table_row(),in ps-pdf.cxx may lead to arbitrary code execution and denial of service.

Vulnerability class: Buffer Overflow

Published 2022-03-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Htmldoc Project — versions 1.9.12
Htmldoc — versions v1.9.12

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/michaelrsweet/htmldoc/issues/417 (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/michaelrsweet/htmldoc/commit/0ddab26a542c74770317b622e985c52430092ba5 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-26259?: CVE-2021-26259 is a high-severity vulnerability in Htmldoc Project, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-03-03.
How severe is CVE-2021-26259?: High severity. CVSS v3 base score is 7.8 out of 10.