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Vulnerability record · CVE-2021-43579 · published 10 January 2022

CVE-2021-43579: Htmldoc project htmldoc out-of-bounds write vulnerability

Htmldoc Project · Htmldoc

A stack-based buffer overflow in image_load_bmp() in HTMLDOC <= 1.9.13 results in remote code execution if the victim converts an HTML document linking to a crafted BMP file.

7.8 CVSS 3.1 High EPSS 7.3% · top 5.8% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 6.8
7.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

A stack-based buffer overflow in image_load_bmp() in HTMLDOC <= 1.9.13 results in remote code execution if the victim converts an HTML document linking to a crafted BMP file.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/michaelrsweet/htmldoc/commit/27d08989a5a567155d506ac870ae7d8cc88fa58b PatchThird Party Advisory
https://github.com/michaelrsweet/htmldoc/compare/v1.9.12...v1.9.13 Release NotesThird Party Advisory
https://github.com/michaelrsweet/htmldoc/issues/453 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/michaelrsweet/htmldoc/issues/456 ExploitIssue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00022.html Mailing ListThird Party Advisory
https://github.com/michaelrsweet/htmldoc/commit/27d08989a5a567155d506ac870ae7d8cc88fa58b PatchThird Party Advisory
https://github.com/michaelrsweet/htmldoc/compare/v1.9.12...v1.9.13 Release NotesThird Party Advisory
https://github.com/michaelrsweet/htmldoc/issues/453 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/michaelrsweet/htmldoc/issues/456 ExploitIssue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00022.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-43579), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.