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TI-2025-21577 Aliases CVE-2025-30258GHSA-5rjg-pf4q-hgcr

Improper check for unusual conditions in GnuPG

Priority LOW 21CWE-754Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 6 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

In GnuPG before 2.5.5, if a user chooses to import a certificate with certain crafted subkey data that lacks a valid backsig or that has incorrect usage flags, the user loses the ability to verify signatures made from certain other signing keys, aka a "verification DoS."

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00194 9th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial GnuPG (GnuPG): 2.5.5Red Hat: 6 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
GnuPGGnuPGbefore 2.5.52.5.5Patch availableCNA
  • GnuPG VendorGnuPG Affected before 2.5.5 Fixed in 2.5.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnupg:gnupg:*:*:*:*:*:*:*:*before 2.4.8; 2.5.0 to before 2.5.5VulnerableGnuPG
  • cpe:2.3:a:gnupg:gnupg:*:*:*:*:*:*:*:* Versions before 2.4.8; 2.5.0 to before 2.5.5 Vulnerable ·GnuPG

Remediation

  • Fix · CNA GnuPG (GnuPG) Fixed in 2.5.5

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)Affected—
Not affected: 1 product
  • Red Hat OpenShift AI (RHOAI)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-30258
  2. 2026-10-03 Alias added: GHSA-5rjg-pf4q-hgcr
  3. 2026-11-06 Affected versions changed · Red Hat

References

Exploit 1

Advisory 1

Other 1

  • TI-2022-03243 Integer overflow in libksba CVSS 3.1CRITICAL 9.8
  • TI-2025-42429 Out-of-bounds write in GnuPG CVSS 3.1HIGH 7.8
  • TI-2025-42428 Improper signature verification in GnuPG CVSS 3.1MEDIUM 5.9
  • TI-2008-01464 GnuPG (gpg) 1.4.8 and 2.0.8 allows remote attackers to cause a denial of service (crash)… CVSS 2.0HIGH 9.3
  • TI-2026-20067 Stack-based buffer overflow in GnuPG CVSS 3.1CRITICAL 9.8
  • TI-2018-08614 mainproc.c in GnuPG before 2.2.8 mishandles the original filename during decryption and… CVSS 3.1HIGH 7.5
See all 34 →

Sources

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