Description
When curl is built with GnuTLS, a malicious WebSocket server can make curl
send memory past its send buffer. This is due to an out of bounds read
following when `gnutls_record_send()` returns a number of bytes sent **greater
than the number of bytes it was given to send**. GnuTLS does that after a
blocked send.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| curl | curl | 8.22.0 – ≤ 8.22.0, 8.21.0 – ≤ 8.21.0, 8.20.0 – ≤ 8.20.0, 8.19.0 – ≤ 8.19.0, 8.18.0 – ≤ 8.18.0, 8.17.0 – ≤ 8.17.0, 8.16.0 – ≤ 8.16.0, 8.15.0 – ≤ 8.15.0, 8.14.1 – ≤ 8.14.1, 8.14.0 – ≤ 8.14.0, 8.13.0 – ≤ 8.13.0, 8.12.1 – ≤ 8.12.1, 8.12.0 – ≤ 8.12.0, 8.11.1 – ≤ 8.11.1, 8.11.0 – ≤ 8.11.0, 8.10.1 – ≤ 8.1… | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | curl | No fix yet | — |
| Debian 13 | curl | No fix yet | — |
| Debian 12 | curl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | curl | 8.20.0-2ubuntu11.1 | USN-8927-2 |
| Ubuntu 26.04 LTS | curl | 8.18.0-1ubuntu2.8 | USN-8927-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | curl +3 | 8.23.0-0.1.hum1 | RHSA-2026:82895 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 8.23.0-1.1 | openSUSE-SU-2026:12150-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 8.23.0-r0 | — |
| Alpine v3.23 | curl | 8.23.0-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | curl +4 | No fix yet | — |
Advisories 5
- WID-SEC-2026-3904 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- USN-8927-1 curl vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8927-2 curl vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- RHSA-2026:82895 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 18, 2026
- openSUSE-SU-2026:12150-1 curl-8.23.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 17, 2026