CVE-2026-103262

NameCVE-2026-103262
DescriptionTornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response. Attackers can send a gzip-encoded decompression bomb that accumulates in memory without size limits, causing the application process to be killed by out-of-memory conditions.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1149712

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python-tornado (PTS)bookworm, bookworm (security)6.2.0-3+deb12u4vulnerable
trixie (security), trixie6.4.2-3+deb13u2vulnerable
forky, sid6.5.5-5vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python-tornadosource(unstable)(unfixed)1149712

Notes

https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vp
Fixed by: https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9 (v6.5.9)
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