DEBIAN-CVE-2026-77680
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-77680
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77680.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-77680
- Upstream
- Published
- 2026-08-25T21:17:46Z
- Modified
- 2026-09-14T17:03:34Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- [none]
- Details
-
An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the CVE-2025-32907 fix. CVE-2025-32907 addressed memory amplification when a client repeated the same range many times in a single Range header. Commit 9bb92f7a corrected merge correctness in soup_message_headers_get_ranges_internal() in libsoup/soup-message-headers.c, but the coalescing loop still removes merged ranges using g_array_remove_index() for each coalesced element. Because GArray is contiguous, each mid-array removal performs an O(N) memmove. When many identical satisfiable ranges are supplied (for example bytes=0-0 repeated thousands of times), the loop performs O(N²) work coalescing them into a single range. The vulnerable path is reachable server-side from handle_partial_get() in libsoup/server/http1/soup-server-message-io-http1.c when a SoupServer handler returns HTTP 200 with a non-empty body. No authentication is required. The number of ranges is bounded only by the maximum request header size (~100 KiB), allowing roughly 25,000 ranges per request. Reporter measurements on libsoup HEAD containing the CVE-2025-32907 fix show ~90 ms single-core CPU per such request at the wire maximum, blocking the server's event loop for that duration. This is a CPU exhaustion / availability issue only. No memory corruption or information disclosure occurs. Affected: libsoup versions containing the CVE-2025-32907 fix but not merge request !550. Fixed upstream: MR !550 merged 2026-08-20, replacing per-element removal with O(N) in-place compaction and rejecting Range headers requesting more than 200 ranges. Upstream report: https://gitlab.gnome.org/GNOME/libsoup/-/issues/538 Related: CVE-2025-32907
- References
Affected packages
Debian:12 / libsoup2.4
Package
- Name
- libsoup2.4
- Purl
- pkg:deb/debian/libsoup2.4?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / libsoup2.4
Package
- Name
- libsoup2.4
- Purl
- pkg:deb/debian/libsoup2.4?arch=source&distro=trixie
Debian:12 / libsoup3
Package
- Name
- libsoup3
- Purl
- pkg:deb/debian/libsoup3?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
3.*
Debian:13 / libsoup3
Package
- Name
- libsoup3
- Purl
- pkg:deb/debian/libsoup3?arch=source&distro=trixie
Debian:14 / libsoup3
Package
- Name
- libsoup3
- Purl
- pkg:deb/debian/libsoup3?arch=source&distro=forky