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TI-2026-77124 Aliases CVE-2026-86412GHSA-cfhr-3c9j-cfhw

Server-set cookie makes curl erase its cookie jar

Priority HIGH 70CWE-754Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
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.

Summary

curl versions 8.18.0, 8.19.0, 8.20.0, 8.21.0 and 8.22.0 are affected. A remote HTTP server can set a cookie that curl writes to a Netscape cookie jar but cannot reload, which is an improper check for unusual or exceptional conditions (CWE-754). On the next run that uses the same file for --cookie and --cookie-jar, curl fails before connecting, then replaces the jar with an empty file, deleting cookies for unrelated domains. A remote attacker needs no privileges and no user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

A remote HTTP server can set a cookie that curl accepts and writes to a Netscape cookie jar but cannot reload. On the next invocation using the same path for `--cookie` and `--cookie-jar`, curl fails before connecting, then the cleanup procedure replaces the jar with an empty file, deleting cookies for unrelated domains.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00828 57th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed 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

VendorProductAffected versionsFixed inStatusSource
curlcurl8.22.0 – 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—No fix listedCNA
  • 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 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

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

CPEVersionsRoleVendor
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. Red Hat has no fix plan available for Red Hat Satellite 6, which it lists as affected.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Red Hat 1 advisory

  • 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

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Satellite 6AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:82895
Not affected: 8 products
  • 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 Hardened Images
  • Red Hat JBoss Core Services
  • Red Hat Satellite 6

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-86412
  2. 2026-10-21 Alias added: GHSA-cfhr-3c9j-cfhw
  3. 2026-10-21 Affected versions changed · Red Hat
  4. 2026-10-29 CVSS score added · CISA ADP
  5. 2026-10-29 Weakness changed · CISA ADP
  6. 2026-10-29 CISA SSVC decision points changed
  7. 2026-10-29 Priority changed: LOW → HIGH
  8. 2026-10-30 EPSS moved to the 50th–90th percentile

References

Other 3

See all 103 →

Sources

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