CVE-2026-39835

ADVISORY - github

Summary

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

EPSS Score⁠: 0.00504 (0.408)

Common Weakness Enumeration (CWE)

ADVISORY - nist

CWE-295⁠

Improper Certificate Validation

CWE-476⁠

NULL Pointer Dereference

ADVISORY - github

CWE-295⁠

Improper Certificate Validation

CWE-476⁠

NULL Pointer Dereference

Impacted images

Advisories

GitHub

CREATED

2 months ago

UPDATED

3 days ago

ADVISORY IDGHSA-78mq-xcr3-xm33⁠

EXPLOITABILITY SCORE

3.9

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-295⁠CWE-476⁠

CVSS SCORE

5.3medium

Package	Type	OS Name	OS Version	Affected Ranges	Fix Versions
golang.org/x/crypto	golang	-	-	<0.52.0	0.52.0

CVSS:3 Severity and metrics

The CVSS metrics represent different qualitative aspects of a vulnerability that impact the overall score, as defined by the CVSS Specification⁠.

The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone). One example of an Adjacent attack would be an ARP (IPv4) or neighbor discovery (IPv6) flood leading to a denial of service on the local LAN segment (e.g., CVE-2013-6014).

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.

The vulnerable system can be exploited without interaction from any user.

An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.

There is no loss of confidentiality.

There is no loss of trust or accuracy within the impacted component.

Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

NIST

CREATED

3 months ago

UPDATED

2 days ago

ADVISORY IDCVE-2026-39835⁠

EXPLOITABILITY SCORE

3.9

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-295⁠CWE-476⁠

CVSS SCORE

5.3medium

Debian

CREATED

3 months ago

UPDATED

1 month ago

ADVISORY IDCVE-2026-39835⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Ubuntu

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY IDCVE-2026-39835⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium

GoLang

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY IDGO-2026-5015⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

CVE-2026-39835

Summary

Common Weakness Enumeration (CWE)

CWE-295⁠

CWE-476⁠

CWE-295⁠

CWE-476⁠

Advisories

GitHub

CVSS SCORE

Attack Vector (AV)Network

Attack Complexity (AC)Low

Privileges Required (PR)None

User Interaction (UI)None

Scope (S)Unchanged

Confidentiality (C)None

Integrity (I)None

Availability (A)Low

NIST

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Debian

Ubuntu

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GoLang

Alma

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Alma

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Alma

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Amazon

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Amazon

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Amazon

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Amazon

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Amazon

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Amazon

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Amazon

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Amazon

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Amazon

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Rocky

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Rocky

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Rocky

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Rocky

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Rocky

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Oracle

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Oracle

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Oracle

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Oracle

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Oracle

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Chainguard

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos