CVE-2025-69418 Affecting openssl package, versions <3.6.1-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CHAINGUARDLATEST-OPENSSL-15144128
- published29 Jan 2026
- disclosed27 Jan 2026
Introduced: 27 Jan 2026
CVE-2025-69418 (opens in a new tab)How to fix?
Upgrade Chainguard openssl to version 3.6.1-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
Issue summary: When using the low-level OCB API directly with AES-NI or<br>other hardware-accelerated code paths, inputs whose length is not a multiple<br>of 16 bytes can leave the final partial block unencrypted and unauthenticated.<br><br>Impact summary: The trailing 1-15 bytes of a message may be exposed in<br>cleartext on encryption and are not covered by the authentication tag,<br>allowing an attacker to read or tamper with those bytes without detection.<br><br>The low-level OCB encrypt and decrypt routines in the hardware-accelerated<br>stream path process full 16-byte blocks but do not advance the input/output<br>pointers. The subsequent tail-handling code then operates on the original<br>base pointers, effectively reprocessing the beginning of the buffer while<br>leaving the actual trailing bytes unprocessed. The authentication checksum<br>also excludes the true tail bytes.<br><br>However, typical OpenSSL consumers using EVP are not affected because the<br>higher-level EVP and provider OCB implementations split inputs so that full<br>blocks and trailing partial blocks are processed in separate calls, avoiding<br>the problematic code path. Additionally, TLS does not use OCB ciphersuites.<br>The vulnerability only affects applications that call the low-level<br>CRYPTO_ocb128_encrypt() or CRYPTO_ocb128_decrypt() functions directly with<br>non-block-aligned lengths in a single call on hardware-accelerated builds.<br>For these reasons the issue was assessed as Low severity.<br><br>The FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected<br>by this issue, as OCB mode is not a FIPS-approved algorithm.<br><br>OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.<br><br>OpenSSL 1.0.2 is not affected by this issue.
References
- https://github.com/openssl/openssl/commit/372fc5c77529695b05b4f5b5187691a57ef5dffc
- https://github.com/openssl/openssl/commit/4016975d4469cd6b94927c607f7c511385f928d8
- https://github.com/openssl/openssl/commit/52d23c86a54adab5ee9f80e48b242b52c4cc2347
- https://github.com/openssl/openssl/commit/a7589230356d908c0eca4b969ec4f62106f4f5ae
- https://github.com/openssl/openssl/commit/ed40856d7d4ba6cb42779b6770666a65f19cb977
- https://openssl-library.org/news/secadv/20260127.txt