CVE-2026-22791Public exploit

Heap corruption via compressed EC point miscalculation

Published Jan 13, 2026 · Updated Jan 13, 2026

Heap buffer overflow in openCryptoki 3.25.0 and 3.26.0 allows local users to corrupt heap memory or crash a host process via C_WrapKey. Within ecdh_aes_key_wrap(), the length query sizes output from the supplied compressed EC point, but the write copies a larger uncompressed transport point and offsets wrapped data using the shorter length. Exploitation requires access to invoke CKM_ECDH_AES_KEY_WRAP against a Soft or ICA token with an attacker-controlled compressed public key.

CVSS severity6.6
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in openCryptoki 3.25.0 and 3.26.0 allows local users to corrupt heap memory or crash a host process via C_WrapKey. Within ecdh_aes_key_wrap(), the length query sizes output from the supplied compressed EC point, but the write copies a larger uncompressed transport point and offsets wrapped data using the shorter length. Exploitation requires access to invoke CKM_ECDH_AES_KEY_WRAP against a Soft or ICA token with an attacker-controlled compressed public key.

The record

CVE
CVE-2026-22791
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
openCryptoki
Product
openCryptoki
Classifications
CWE-131, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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=>= 3.25.0, <= 3.26.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

openCryptoki · openCryptokiversion=>= 3.25.0, <= 3.26.0

Published CVSS scores

6.6GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
6.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
T1499.004Application or System Exploitation

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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