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CVE-2021-29495

Nim stdlib httpClient does not validate peer certificates by default

HIGH
7.5
CVSS Score
Published: May 7, 2021 at 03:15 PM UTC
Updated: June 17, 2026 at 03:47 AM UTC
2 products affected across 1 vendorNimLang Nim

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%

Description

Nim is a statically typed compiled systems programming language. In Nim standard library before 1.4.2, httpClient SSL/TLS certificate verification was disabled by default. Users can upgrade to version 1.4.2 to receive a patch or, as a workaround, set "verifyMode = CVerifyPeer" as documented.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nim· Nim Lang
95%
v < 1.4.2
Affected range stops below 1.4.2, so it looks safe — our inference, not a vendor statement
Lang Nim· Nim Lang
60%
v < 1.4.2
Affected range stops below 1.4.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/nim-lang/security/security/advisories/GHSA-9vqv-2jj9-7mqr

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

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