CVE-2026-4115Disclosure(putty / putty)

LOWCVSS 2.9 · LOW

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-345CWE-347

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • putty

Threat summary

  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • General: 1 classified signal
  • Peaked 1d ago at 2 mentions (2026-03-22); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
Products
putty

1 version affected across 1 product

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-03-22: 2Mentions · 2026-03-23: 1Technical Details · 2026-03-22: 203-2203-23
Signal classification2 categories
Disclosure
266.7%
General
133.3%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-03-222
Disclosure2
2026-03-231
General1
Full discourse3 posts
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-4115 Ed25519 Signature Verification Vulnerability in PuTTY 0.83 Remote Attack Surface https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-4115

    Post summary

    The text announces the disclosure of CVE‑2026‑4115, describing an Ed25519 signature verification flaw in PuTTY 0.83, without detailing PoC, exploit, or patch information.

    0000155
    4.0K followersView on X
  • CVE@CVEnew
    General

    CVE-2026-4115 A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulat… https://www.cve.org/CVERecord?id=CVE-2026-4115

    Post summary

    The post reports a CVE affecting PuTTY's Ed25519 handler, but offers no PoC, exploit, patch, or evidence of active use.

    00000109
    56.8K followersView on X
  • CyberDudeBivash® | Global Cybersecurity Company@cyberbivash
    Disclosure

    🚨 CYBERDUDEBIVASH SENTINEL APEX ALERT 🚨 Threat: CVE-2026-4115 - PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify weak authentication Intel Report: https://ift.tt/ogb2Qc0

    Post summary

    Alert announces CVE‑2026‑4115, highlighting weak authentication in PuTTY’s eddsa_verify implementation, with no exploit code or patch details provided.

    0000019
    292 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appputtyputty0.83--

Explore more