CVE Explorer

CVE-2026-44909

Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer. A remote, unauthenticated attacker could exploit HTTP/2 flow-control by setting SETTINGS_INITIAL_WINDOW_SIZE to 0 or withholding WINDOW_UPDATE frames, causing the server to buffer complete response bodies in memory indefinitely for stalled streams. By opening many simultaneous streams requesting large resources while preventing the server from transmitting responses, an attacker could induce unbounded

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8f055a8e4a2d5a1123ecb12fc47c11c38786e0f263b239ee4acade4b087a4815

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"proxygen","vendor":"Facebook","versions":[{"lessThan":"v2026.07.20.00","status":"affected","version":"v2017.01.16.00","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:0583118a9483cad65be5ce0c33352744dc95171290c8d370c2a22d106b1144c3 · sha256:dc3c7fa25ef14e24… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:0583118a9483cad65be5ce0c33352744dc95171290c8d370c2a22d106b1144c3 · sha256:dc3c7fa25ef14e24… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"description":"CWE-770","lang":"en"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:0583118a9483cad65be5ce0c33352744dc95171290c8d370c2a22d106b1144c3 · sha256:dc3c7fa25ef14e24… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"tags":["x_refsource_CONFIRM"],"url":"https://github.com/facebook/proxygen/commit/f28742f21f7022c261b7620d4e6b20d82b6cff72"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:0583118a9483cad65be5ce0c33352744dc95171290c8d370c2a22d106b1144c3 · sha256:dc3c7fa25ef14e24… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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