Heap buffer over-read in GnuTLS SCT extension parsing
CVE-2025-32989 is a heap-buffer-overread vulnerability in GnuTLS during X.509 certificate parsing. The flaw occurs in handling of the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension, identified by OID 1.3.6.1.4.1.11129.2.4.2. A maliciously crafted certificate containing a malformed SCT extension can trigger out-of-bounds reads from heap memory when GnuTLS parses and verifies certificates. According to the provided description, this can expose sensitive data because the SCT content is not checked correctly during certificate verification for certain websites.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.