CVE-2025-32990: gnutls · Heap-based Buffer Overflow
Affects gnutlsSource CVE Database V5
Not known to be exploited · CVSS 6.5 Medium : upgrade to 10.3.0 or 9.9.0 when convenient.
Data as of 26 Oct 2026, 10:12 UTC
- EPSS
- 0.8% chance of exploitation in 30 days – higher than 59% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 10.3.0, 9.9.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LExploitation evidence
Disclosed: evidence found.
CVE published 10 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade the Debian debian/gnutls package to 10.3.0 or 9.9.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Debiandebian/gnutlspkg:deb/debian/gnutlsOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Red Hat has released official security updates for GnuTLS that address this vulnerability. Users of Red Hat Enterprise Linux 9 and 10 should apply the relevant security advisories RHSA-2025:16115 and RHSA-2025:16116 promptly to update the gnutls packages. Detailed update instructions are available at https://access.redhat.com/articles/11258. Applying these updates mitigates the vulnerability. No additional mitigation actions are required beyond applying the official patches.
Description
A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic within the certtool utility. When it reads certain settings from a template file, it allows an attacker to cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial-of-service (DoS) that could potentially crash the system.
References
- access.redhat.com/errata/RHSA-2025:16115 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:16116 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17181 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17348 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17361 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17415 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:19088 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:22529 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:7477 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2025-32990 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2359620 (opens in a new tab)
- lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/08/msg00005.html (opens in a new tab)
- openwall.com/lists/oss-security/2025/07/11/3 (opens in a new tab)