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Mageia 9 PuTTY Critical Signature Failure Double Free CVE-2026-4115

mageia
Calendar Grey June 15, 2026
Dist Mageia Esm H88
Critical security update for Mageia 9 addressing multiple issues in PuTTY due to signature failures and memory errors.
Security update

Summary

Description: ECDSA signature verification can be made to fail an assertion. Server can provoke a double free in RSA KEX code. Telnet session data is marked with trust sigils after authenticating to a proxy. PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification. (CVE-2026-4115)

References

- https://bugs.mageia.org/show_bug.cgi?id=35585

- https://www.openwall.com/lists/oss-security/2026/05/24/11

- https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html

- https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/rsakex-double-free.html

- https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/telnet-trust-sigil.html

- https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/eddsa-overlarge-s.html

- https://www.cve.org/CVERecord?id=CVE-2026-4115

Topics%20covered

Topics Covered

security advisory critical double-free signature issue putty Mageia

Resolution

SRPMS

- 9/core/putty-0.84-1.mga9

Severity
critical
Lowest
Low
Medium
High
Critical

Publication date: 15 Jun 2026
URL: https://advisories.mageia.org/MGASA-2026-0210.html
Type: security
CVE: CVE-2026-4115

Topics%20covered

Topics Covered

security advisory critical double-free signature issue putty Mageia

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