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Vulnerability record · CVE-2026-81707 · published 27 August 2026

CVE-2026-81707: Improper input validation vulnerability

openssl_encrypt before 1.4.9 fails to sanitize the email field of imported identity documents, allowing attackers to inject ANSI escape sequences that forge the fingerprint verification line displayed to users. Attackers can deliver a crafted identity bundle through normal contact-exchange flows or keyserver responses to manipulate terminal output and display a fraudulent fingerprint, bypassing the out-of-band verification mechanism that protects against key substitution attacks.

9.3 CVSS 4.0 Critical EPSS 0.59% · top 54.1% CWE-20 · Improper input validation Deferred
9.3CVSS 4.0 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
23 Sep 2026Last modified by NVD

Description

openssl_encrypt before 1.4.9 fails to sanitize the email field of imported identity documents, allowing attackers to inject ANSI escape sequences that forge the fingerprint verification line displayed to users. Attackers can deliver a crafted identity bundle through normal contact-exchange flows or keyserver responses to manipulate terminal output and display a fraudulent fingerprint, bypassing the out-of-band verification mechanism that protects against key substitution attacks.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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:

References

LinkTags
https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-qjr2-x6mr-8xgf
https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-ansi-escape-injection-via-identity-email

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Source: NIST National Vulnerability Database (record CVE-2026-81707), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.