OpenSSL DoS flaw awaits patch
A newly disclosed OpenSSL vulnerability allows remote attackers to trigger denial of service, and fixes are not yet available.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
ANSSI/CERT-FR has issued an advisory for a remote denial-of-service vulnerability affecting OpenSSL, one of the most widely deployed cryptographic libraries underpinning TLS/SSL communications across countless applications and services. The flaw impacts OpenSSL versions 3.5.x prior to 3.5.8, 3.6.x prior to 3.6.4, and 4.0.x prior to 4.0.2.
Notably, the vendor has not yet released patches for this issue, leaving affected organizations without an immediate remediation path. Given OpenSSL's ubiquity in servers, network appliances, and applications handling encrypted traffic, the vulnerability could be leveraged to disrupt services relying on the library, though no active exploitation has been reported. Organizations should monitor the referenced OpenSSL security advisory for forthcoming patch availability and prepare to apply updates promptly once released.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1026
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