AES-GCM-SIV AAD Forgery After Zero-length Incremental AAD Update

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-88823
StatePUBLISHED
Assigneropenssl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-10 19:21:34 UTC
Updated2026-11-10 22:10:04 UTC
DescriptionIssue summary: The AES-GCM-SIV implementation treats a zero-length Additional Authenticated Data (AAD) update as a reset of all the AAD supplied so far, instead of leaving the AAD unchanged. An application that supplies its AAD in several fragments, one of which is empty, therefore produces or verifies messages whose authentication tag does not cover the AAD supplied before the empty fragment. Impact summary: Data an application intended to authenticate alongside a message is silently left unauthenticated. An attacker can forge the AAD of such a message. CWE: CWE-325: Missing Cryptographic Step Description: An application passing AAD in multiple chunks of which some have zero length will have the previous AAD chunks effectively unauthenticated. Also, on context re-initialisation, the AAD was not reset, which meant that any AAD accumulated from the previous context usage were also included in the AAD of the new message. The fix makes a zero-length AAD update a no-op and clears any accumulated AAD whenever the context is re-initialised with a key or a nonce. A re-initialisation that only changes parameters keeps the AAD. FIPS impact: no The FIPS modules are not affected, as AES-GCM-SIV is not a FIPS approved algorithm and is implemented only in the default provider, outside the OpenSSL FIPS module boundary.

Risk And Classification

Problem Types: CWE-325 | CWE-325 CWE-325 Missing Cryptographic Step

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSSL OpenSSL affected 4.1.0 4.1.1 semver Not specified
CNA OpenSSL OpenSSL affected 4.0.0 4.0.4 semver Not specified
CNA OpenSSL OpenSSL affected 3.5.0 3.5.10 semver Not specified

References

ReferenceSourceLinkTags
github.com/openssl/openssl/commit/6747b1a278816dd7db46438040a70b0b5e5e0a90 [email protected] github.com
github.com/openssl/openssl/commit/159e1de0c448d7b9f09ad768c8e141def4aa1eb4 [email protected] github.com
openssl-library.org/news/secadv/20261110.txt [email protected] openssl-library.org
github.com/openssl/openssl/commit/2f5fc833ff9b5bfe00b32f8b5c74f73c5773c682 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jérémy Jean (ANSSI) (en)

CNA: Bhargava Shastry (en)

CNA: Jonathan Bateman (Rochester Institute of Technology) (en)

CNA: Daniel Kubec (en)

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