CVE-2025-30258: In GnuPG before 2.5.5, if a user chooses to import a certificate with certain crafted subkey data that lacks a

Routine

LOW 2.7UPGRADE

CVE-2025-30258 is a low-severity flaw (CVSS 2.7) affecting gnupg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	2.7 (Low)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-754
Published	2025-03-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gnupg

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-19 20:15 UTCPublished CVE record published
2026-06-17 09:08 UTCUpdated Record last modified

gnupg gnupg UPGRADE

Affected: < 2.4.8 · >= 2.5.0 and < 2.5.5

Fixed in: 2.4.8, 2.5.5

Safe to downgrade to: a release before 2.5.0

1. Check installed version

apt-cache policy gnupg || rpm -q gnupg || gnupg --version

2. UPGRADE to 2.4.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gnupg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gnupg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.5.0 (Debian / Ubuntu)

apt-cache madison gnupg sudo apt install gnupg=<VERSION_BEFORE_2.5.0> sudo apt-mark hold gnupg

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gnupg sudo dnf downgrade gnupg-<VERSION_BEFORE_2.5.0> sudo dnf versionlock add gnupg

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-30258?

gnupg: upgrade to 2.4.8, 2.5.5. Exact commands for each OS are on this page.

Is CVE-2025-30258 being exploited?

CVE-2025-30258 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-30258 affect?

CVE-2025-30258 affects gnupg. Severity is low (CVSS 2.7). 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

How urgent is CVE-2025-30258?

Priority 17/100. Public exploit reference

Software pages

GnuPG vulnerabilities

Related CVEs

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CVE-2026-24882 HIGH 8.4 UPGRADE UPGRADE In GnuPG before 2.5.17, a stack-based buffer overflow exists in tpm2daemon during handling of the PKDECRYPT co
CVE-2026-24881 HIGH 8.1 UPGRADE UPGRADE In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key
CVE-2026-24883 LOW 3.7 UPGRADE UPGRADE In GnuPG before 2.5.17, a long signature packet length causes parse_signature to return success with sig->data

References

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