CVE catalog

CVE-2026-87861

curl: CVE-2026-87861

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: Oct 13, 2026, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.22% · Oct 25, 2026

When using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connection previously authenticated via Negotiate for a different origin, leaving the request's intended credentials unused.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	curl	sid	`8.23.0-1`	fixed
Debian	curl	forky	`8.22.0-1`	vulnerable
Debian	curl	trixie	`8.14.1-2+deb13u5`	not affected
Debian	curl	trixie-security	`8.14.1-2+deb13u7`	not affected
Debian	curl	bookworm	`7.88.1-10+deb12u15`	not affected
Debian	curl	bookworm-security	`7.88.1-10+deb12u5`	not affected
Alpine	curl	3.23	`8.23.0-r0`	fixed
Alpine	curl	3.24	`8.23.0-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	curl	source	sid	`8.23.0~rc1-1`	not yet assigned	Not reported	Not reported
Debian	curl	source	forky	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	curl	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	curl	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Alpine	curl	apk	3.23	`8.23.0-r0`	Not reported	ALPINE-CVE-2026-87861	Not reported
Alpine	curl	apk	3.24	`8.23.0-r0`	Not reported	ALPINE-CVE-2026-87861	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[curl]Not affected
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
[libcurl3-gnutls]Not affected
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
[libcurl3-nss]Not affected
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
[libcurl4]Not affected
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
[libcurl4-doc]Not affected
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · all · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · all · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · all · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · all · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
[libcurl4-gnutls-dev]Not affected
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
[libcurl4-nss-dev]Not affected
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
[libcurl4-openssl-dev]Not affected
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · curl · debian · bookworm

Observed: Oct 27, 2026, 4:44:02 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]