Facebook Proxygen 2024.10.28.00/2026.07.20.00/2026.09.28.00 QPACK Decoder allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in Facebook Proxygen. The affected element is an unknown function of the component QPACK Decoder. The manipulation results in allocation of resources. This vulnerability is known as CVE-2026-119235. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Facebook Proxygen. Affected is an unknown functionality of the component QPACK Decoder. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. This is going to have an impact on availability. CVE summarizes:

proxygen's QPACK decoder enforced its size limit on a string literal in an encoder-stream instruction only after the entire literal had been received. A remote, unauthenticated HTTP/3 peer could send an insert instruction on the QPACK encoder stream that declares an arbitrarily large literal and then keep sending data, causing the decoder to buffer it without bound for the lifetime of the connection and exhaust memory, leading to denial of service. The issue occurs regardless of the advertised QPACK dynamic table capacity, including when the dynamic table is disabled. This issue affects proxygen versions prior to v2026.11.09.00.

The advisory is available at facebook.com. This vulnerability is traded as CVE-2026-119235 since 10/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/11/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 2026.11.09.00 eliminates this vulnerability.

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Productinfo

Type

• Social Network Software

Vendor

• Facebook

Name

• Proxygen

Version

• 2024.10.28.00
• 2026.07.20.00
• 2026.09.28.00

License

• free

CPE 2.3info

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CPE 2.2info

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Entryinfo

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