PuTTY up to 0.83 ECDSA Signature assertion

Summaryinfo

A vulnerability has been found in PuTTY up to 0.83 and classified as problematic. This affects an unknown function of the component ECDSA Signature Handler. Performing a manipulation results in assertion. This vulnerability is identified as CVE-2026-48852. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in PuTTY up to 0.83. This affects an unknown part of the component ECDSA Signature Handler. The manipulation with an unknown input leads to a assertion vulnerability. CWE is classifying the issue as CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. This is going to have an impact on availability. The summary by CVE is:

PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

It is possible to read the advisory at lists.tartarus.org. This vulnerability is uniquely identified as CVE-2026-48852 since 05/25/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 316786 (Linux Distros Unpatched Vulnerability : CVE-2026-48852), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.84 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (316786). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Connectivity Software

Name

• PuTTY

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.38
• 0.39
• 0.40
• 0.41
• 0.42
• 0.43
• 0.44
• 0.45
• 0.46
• 0.47
• 0.48
• 0.49
• 0.50
• 0.51
• 0.52
• 0.53
• 0.54
• 0.55
• 0.56
• 0.57
• 0.58
• 0.59
• 0.60
• 0.61
• 0.62
• 0.63
• 0.64
• 0.65
• 0.66
• 0.67
• 0.68
• 0.69
• 0.70
• 0.71
• 0.72
• 0.73
• 0.74
• 0.75
• 0.76
• 0.77
• 0.78
• 0.79
• 0.80
• 0.81
• 0.82
• 0.83

License

• open-source

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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