CVE-2026-81856

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.40% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 33.9% of scored records. A rank, not a probability.

NVD base score

2.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-16.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-12 15:46Z16 DAYS AGO

Last updated

2026-10-16 17:47Z12 DAYS AGO

Reserved

2026-08-31

Assigning CNA

EEF

Record state

PUBLISHED

Severity

Low (CVSS 2.3)

CNA CVSS vector

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

Weaknesses

• CWE-150Improper Neutralization of Escape, Meta, or Control SequencesVariant
• CWE-117Improper Output Neutralization for LogsBase

Data version

5.2

Document digest

5c73d23fda72cf2cb117bcbeab80c479117c8f69e70d44db17d7ccee46d5ffca

• github.comGitHub Advisoryhttps://github.com/hexpm/hex/security/advisories/GHSA-fpmj-3cxg-p766relatedvendor-advisory
• cna.erlef.orgEEF CNA record for CVE-2026-81856https://cna.erlef.org/cves/CVE-2026-81856.htmlrelated
• osv.devOSV record EEF-CVE-2026-81856https://osv.dev/vulnerability/EEF-CVE-2026-81856related
• github.comIntroducing commit 211303e in hexpm/hexhttps://github.com/hexpm/hex/commit/211303e3f68f5d3ce06450c1ff1a7a770a9ab236related
• github.comFix commit dd3305d in hexpm/hexhttps://github.com/hexpm/hex/commit/dd3305ddf0032f6d0b468fd40dbbc3072bfcb8b8patch