CVE-2026-91095

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-91095
StatePUBLISHED
AssignerMeta
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-28 21:17:19 UTC
Updated2026-09-30 20:17:36 UTC
DescriptionIn proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS: 0.001450000 probability, percentile 0.031230000 (date 2026-09-29)

Problem Types: CWE-416 | Use After Free (CWE-416) | CWE-416 CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Facebook Proxygen affected v2024.10.28.00 v2026.09.28.00 semver Not specified

References

ReferenceSourceLinkTags
github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa8... [email protected] github.com
www.facebook.com/security/advisories/cve-2026-91095 [email protected] www.facebook.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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