DEBIAN-CVE-2026-7790
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-7790
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-7790.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-7790
- Upstream
- Published
- 2026-05-11T19:16:29Z
- Modified
- 2026-09-14T17:03:34Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Uncontrolled Resource Consumption vulnerability in ninenines cowlib (cow_http_te module) allows Excessive Allocation. The chunked transfer-encoding parser in cow_http_te accepts an unbounded number of hex digits in the chunk-size field. Each digit causes a bignum multiplication (Len * 16 + digit), so parsing N hex digits requires O(N²) CPU work and O(N) memory. Additionally, when input is drip-fed, the parser discards the accumulated length on each partial read and restarts from zero on resumption, raising the cost to O(N³). An unauthenticated remote attacker can exploit this by sending an HTTP/1.1 request with Transfer-Encoding: chunked and a very long chunk-size hex string to cause denial of service through CPU exhaustion and memory amplification. This vulnerability is associated with program file src/cow_http_te.erl and program routines cow_http_te:stream_chunked/2, cow_http_te:chunked_len/4. This issue affects cowlib: from 0.6.0 before 2.16.1.
- References
Affected packages
Debian:12 / erlang-cowlib
Package
- Name
- erlang-cowlib
- Purl
- pkg:deb/debian/erlang-cowlib?arch=source&distro=bookworm
Debian:13 / erlang-cowlib
Package
- Name
- erlang-cowlib
- Purl
- pkg:deb/debian/erlang-cowlib?arch=source&distro=trixie
Debian:14 / erlang-cowlib
Package
- Name
- erlang-cowlib
- Purl
- pkg:deb/debian/erlang-cowlib?arch=source&distro=forky