CVE-2026-100888CWE-119CWE-787

CVE-2026-100888

High · published September 28, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
20.8
In the wild
Unconfirmed
What it is

A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. This affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. Executing a manipulation of the argument h can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.00293 · 20.8th percentile
Weaknesses
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer; CWE-787 · Out-of-bounds Write
Published
2026-09-28T04:16Z
References (5)
https://vuldb.com/cve/CVE-2026-100888 · [email protected]https://vuldb.com/submit/917015 · [email protected]https://vuldb.com/vuln/410837 · [email protected]https://vuldb.com/vuln/410837/cti · [email protected]https://weitongli.com/share/opendkim-h-tag-oob-write.html · [email protected]
EPSS history
Timeline
  • 01 OCT 03:44Z
    EPSS moved — → 0%
    epss
  • 27 SEP 23:30Z
    Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write
    cvelistv5