| Name | CVE-2026-10536 |
| Description | A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| curl (PTS) | bullseye | 7.74.0-1.3+deb11u13 | fixed |
| bullseye (security) | 7.74.0-1.3+deb11u16 | fixed |
| bookworm | 7.88.1-10+deb12u15 | vulnerable |
| bookworm (security) | 7.88.1-10+deb12u5 | vulnerable |
| trixie | 8.14.1-2+deb13u4 | vulnerable |
| forky | 8.20.0-5 | vulnerable |
| sid | 8.21.0-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | bullseye | (not affected) | | | |
| curl | source | (unstable) | 8.21.0~rc2-1 | | | |
Notes
[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <postponed> (Minor issue; needs rare CURLOPT_STREAM_DEPENDS + reset/cleanup)
[bullseye] - curl <not-affected> (Vulnerable code introduced in 7.88.0; bullseye ships 7.74.0)
https://curl.se/docs/CVE-2026-10536.html
Introduced with: https://github.com/curl/curl/commit/71b7e0161032927cdfb4e75ea40f65b8898b3956 (curl-7_88_0)
Fixed by: https://github.com/curl/curl/commit/bfbff7852f050232edd3e5ca5c6bf2021c340f5a (rc-8_21_0-1, curl-8_21_0)