CVE-2026-84947
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.
Scoring
- Severity
- LOW
- CVSS base score
- 3.7
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS probability
- 0.19%
- CWE
- CWE-20, CWE-248
- Published
- 2026-09-04
- Last modified
- 2026-09-04
Affected products
- undici undici
- undici undici
- undici undici
- undici undici
Weakness type
Related vulnerabilities
- CVE-2026-54694 — NationalSecurityAgency/skills-service has Stored XSS via User Registration Enabling Admin Account Takeover
- CVE-2026-86768 — Snipe-IT before 8.7.0 Improper Input Validation via API Checkout
- CVE-2025-71417 — PocketMine-MP before 5.32.1 Denial of Service via ResourcePackClientResponsePacket
- CVE-2024-58380 — PocketMine-MP before 5.11.2 Denial of Service via BookEditPacket
- CVE-2023-54393 — PocketMine-MP before 4.20.5 Denial of Service via LoginPacket
- CVE-2023-54392 — PocketMine-MP before 4.22.3 Denial of Service via BlockActorDataPacket
- CVE-2026-74761 — Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Spoofing of RemoveSubscription clientId
- CVE-2026-73334 — Apache Parquet Hadoop: File-controlled KMS URL is forwarded to pluggable KmsClient that skips host validation