# CVE-2026-119235: CVE-2026-119235

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Facebook / proxygen: ≥ v0.0.0.0; < v2026.11.09.00 (affected, semver). Source: CNA: Meta

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.facebook.com/security/advisories/cve-2026-119235 (CNA: Meta; x_refsource_CONFIRM)

- https://github.com/meta/proxygen/commit/daf245bba7fe1304b9491403fe56f91153299781 (CNA: Meta; x_refsource_MISC)

- https://github.com/meta/proxygen/commit/daf245bba7fe1304b9491403fe56f91153299781 (cve-assign@fb.com)

- https://www.facebook.com/security/advisories/cve-2026-119235 (cve-assign@fb.com)

## Provenance

- CNA: Meta: https://www.cve.org/CVERecord?id=CVE-2026-119235; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-119235; retrieved 2026-11-11; source updated 2026-11-11

Revision: bf4f4351bf010d3c18ff3502c23360917fd034421a9238d5df3eac927a9ee743

Canonical: https://y2.dev/cve/CVE-2026-119235

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