CVE-2026-10536

unknown

Published 2026-07-03 · Modified 2026-07-03

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

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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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-10536 NameCVE-2026-10536 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) Vulnerable and fixed packages The table below lists information on source packages. Source PackageReleaseVersionStatus curl (PTS)bullseye7.74.0-1.3+deb11u13vulnerable bullseye…

CVE-2026-10536

Name	CVE-2026-10536
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	vulnerable
	bullseye (security)	7.74.0-1.3+deb11u16	vulnerable
	bookworm	7.88.1-10+deb12u14	vulnerable
	bookworm (security)	7.88.1-10+deb12u5	vulnerable
	trixie	8.14.1-2+deb13u3	vulnerable
	forky	8.20.0-5	vulnerable
	sid	8.21.0~rc3-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
curl	source	(unstable)	8.21.0~rc2-1

Notes

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)

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

https://curl.se/docs/CVE-2026-10536.htmlIntroduced 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)

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Affected	—
sid	Fixed	`8.21.0~rc2-1`
forky	Affected	—
bullseye	Affected	—
bookworm	Affected	—

References

CWEs

CWE-416

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.