Loading vulnerability…
CVE-2026-54876 is a client-side memory leak in OpenSSL OCSP response checking affecting OpenSSL 4.0 and 3.6. During X.509 certificate-chain verification, a malformed but decoder-accepted BasicOCSPResponse containing an empty SEQUENCE OF SingleResponse entries can cause an early return that bypasses cleanup. Consequently, the OCSP_BASICRESP object allocated by OCSP_response_get1_basic() is not released. An attacker can increase the leaked allocation by including bogus certificates in the BasicOCSPResponse certificate field; these certificates are parsed and retained before the empty-response condition is handled.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A low-severity OpenSSL client-side memory leak in OCSP response checking that can allow a malicious TLS server to exhaust memory in long-running client applications, leading to denial of service.
A low-severity client-side memory leak in OpenSSL OCSP response checking that can let a malicious TLS server exhaust memory in long-running TLS clients when OCSP response checking is explicitly enabled.
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.