CVE-2026-81707Public exploitNetwork attack vectorHinoki check available

Fingerprint verification bypass via terminal escape injection

Published Aug 27, 2026 · Updated Aug 27, 2026

ANSI escape injection in OpenSSL Encrypt before 1.4.9 allows remote attackers to forge identity fingerprint displays via crafted bundles. Identity.import_public accepts an imported document's email field without control-character validation, and CLI identity views print it directly above the genuine fingerprint. Delivery through contact exchange or a keyserver response is sufficient to replace the displayed fingerprint and undermine out-of-band key verification.

CVSS severity9.3
Critical
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

ANSI escape injection in OpenSSL Encrypt before 1.4.9 allows remote attackers to forge identity fingerprint displays via crafted bundles. Identity.import_public accepts an imported document's email field without control-character validation, and CLI identity views print it directly above the genuine fingerprint. Delivery through contact exchange or a keyserver response is sufficient to replace the displayed fingerprint and undermine out-of-band key verification.

The record

CVE
CVE-2026-81707
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
jahlives
Product
OpenSSL Encrypt
Classifications
CWE-20, CWE-150, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

jahlives · OpenSSL Encryptversion=0 <1.4.9

Published CVSS scores

9.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-150Improper Neutralization of Escape, Meta, or Control Sequences
T1036Masquerading

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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