TI-2026-73777 Aliases CVE-2026-92392 GHSA-7jvw-75gf-2h34

Use-after-free in curl HTTP/2 upload handling

HIGH 70CWE-416Published 2026-10-14 · Updated 2026-10-20

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

curl versions 8.12.0, 8.12.1, 8.13.0, 8.14.0, 8.14.1, 8.15.0, 8.16.0, 8.17.0, 8.18.0, 8.19.0, 8.20.0, 8.21.0 and 8.22.0 are affected. During an upload, curl mishandles an HTTP/2 RST_STREAM from the server, which leads to a use-after-free of a struct Curl_easy object (CWE-416). A malicious server can trigger this with high attack complexity, without privileges or user interaction, causing high impact to confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

During an upload, curl mishandles HTTP/2 `RST_STREAM` received from the server (with reason `HTTP_1_1_REQUIRED` or `REFUSED_STREAM`) leading to a use after free of a `struct Curl_easy` object.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01284 70th percentileScored 2026-11-07

Fix Partial Red Hat: 2 advisoriesRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
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	—	No fix listed	CNA

curl Vendorcurl Affected 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 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:haxx:curl::::::::	—	—	Haxx

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* Versions — — ·Haxx

Remediation

The sources list no fixed version for curl. Red Hat fixes Red Hat Hardened Images in RHSA-2026:82895 and RHSA-2026:80349. Red Hat Enterprise Linux 10 is affected without a fix, and Red Hat lists no available plan for it.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Red Hat 2 advisories

RHSA-2026:82895 Released 2026-10-14 · Red Hat rating Important
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images curl-8.23.0-0.1.hum1@aarch64, curl-8.23.0-0.1.hum1@s390x, curl-8.23.0-0.1.hum1@src +10
RHSA-2026:80349 Released 2026-10-11 · Red Hat rating Important
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images cargo-1.99.0-1.hum1@aarch64, cargo-1.99.0-1.hum1@s390x, cargo-1.99.0-1.hum1@x86_64 +47

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet
Red Hat Hardened Images	Fixed	RHSA-2026:80349, RHSA-2026:82895

Not affected: 8 products

Confidential Compute Attestation
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat JBoss Core Services
Red Hat Satellite 6

Timeline

2026-10-14 Threatist record created from CVE-2026-92392
2026-10-14 Alias added: GHSA-7jvw-75gf-2h34
2026-10-15 Fix available: RHSA-2026:82895 · Red Hat
2026-10-15 Fix available: RHSA-2026:80349 · Red Hat
2026-10-15 CVSS score added · CISA ADP
2026-10-15 Weakness changed · CISA ADP
2026-10-15 CISA SSVC decision points changed
2026-10-15 Priority changed: LOW → HIGH
2026-10-16 Fix available: Red Hat Hardened Images · Red Hat
2026-10-16 CVSS score added · Red Hat
2026-10-18 Affected versions changed · Red Hat
2026-10-19 EPSS moved to the 50th–90th percentile

References

Other 3

TI-2023-19922 Out-of-bounds write in curl CVSS 3.1CRITICAL 9.8
TI-2026-16162 Negotiate ambient user conn reuse CVSS 3.1CRITICAL 9.8
TI-2026-10231 cross-origin Digest auth state leak CVSS 3.1CRITICAL 9.8
TI-2026-09063 HTTP/2 stream-dependency tree UAF CVSS 3.1CRITICAL 9.8
TI-2026-07976 stale proxy password leak CVSS 3.1CRITICAL 9.8
TI-2026-07845 SASL double-free CVSS 3.1CRITICAL 9.8

See all 103 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences