CVE record · CVE-2026-81856

Terminal escape sequence injection in Hex via unneutralized server-supplied output

CVSS 2.3 LowEPSS 0.0040 · 34th percentile

Published by the CVE Program (CNA: EEF) at 12 Oct 2026, 15:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
hexpm	hex Package name: hex pkg:otp/hex?repository_url=https:%2F%2Fgithub.com%2Fhexpm%2Fhex&vcs_url=repository_url=git%2Bhttps:%2F%2Fgithub.com%2Fhexpm%2Fhex.git	affected 0.0.1 to before 2.5.2 semver Other versions: unaffected
hexpm	hex Package name: hexpm/hex https://github.com pkg:github/hexpm/hex	affected 211303e3f68f5d3ce06450c1ff1a7a770a9ab236 to before dd3305ddf0032f6d0b468fd40dbbc3072bfcb8b8 git Other versions: unaffected

Identifiers: CVE-2026-81856
CNA: EEF
Weakness (CWE): CWE-150
Tags: hex
CWE-150
Published: 12 Oct 2026
Updated: 16 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
2.3	Low	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N	CNA (EEF)

CISA KEV Not listed.
EPSS 0.0040, the 34th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 12 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/hexpm/hex/security/advisories/GHSA-fpmj-3cxg-p766 relatedvendor-advisory
cna.erlef.org/cves/CVE-2026-81856.html related
osv.dev/vulnerability/EEF-CVE-2026-81856 related
github.com/hexpm/hex/commit/211303e3f68f5d3ce06450c1ff1a7a770a9ab236 related
github.com/hexpm/hex/commit/dd3305ddf0032f6d0b468fd40dbbc3072bfcb8b8 patch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.