Bug 2540149 - CVE-2026-84947 fbthrift: Undici: Response truncation and connection termination [fedora-all]
Summary: CVE-2026-84947 fbthrift: Undici: Response truncation and connection terminati...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: fbthrift
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Michel Lind
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["292a16f9-4ffe-4c60-a608-7...
Depends On:
Blocks: CVE-FalsePositive-Unshipped CVE-2026-84947
TreeView+ depends on / blocked
 
Reported: 2026-09-24 15:03 UTC by Ganesh
Modified: 2026-09-29 19:18 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2026-09-29 19:18:22 UTC
Type: ---
Embargoed:


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Description Ganesh 2026-09-24 15:03:57 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

undici's dump interceptor reads and discards a response body up to a configurable maximum size. When a response declares a Content-Length that exceeds the maximum, the interceptor aborts cleanly, but when a response has no Content-Length and is chunked, the interceptor instead signals completion early once the accumulated size reaches the maximum, without pausing or aborting the request. Because the underlying parser keeps delivering body bytes, a second completion signal fires and trips an internal assertion, which aborts the request and tears down the connection. The application is left observing a misleading successful status with an empty or truncated body while the connection has actually been disconnected. This affects undici versions from 7.1.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.

Comment 1 Michel Lind 2026-09-29 19:18:22 UTC
This CVE is in a JavaScript/NodeJS package; the JavaScript here is not shipped in the binary RPMs.


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