CVE-2026-75805VulnerabilityPublished 29 Sep 2026Updated 10 Nov 2026

openssl · Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL

Affects opensslSource GCVE Database

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Authoritative record:CVE-2026-75805· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium · fixed in 3.0.2-0ubuntu1.30 : update openssl when convenient.

Data as of 12 Nov 2026, 23:24 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CISA-ADP	CVSS 3.1	5.3

EPSS: 0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.0.2-0ubuntu1.30, 3.0.13-0ubuntu3.16, 3.5.5-1ubuntu3.6

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: 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.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: 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.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-gpg3-m652-f2vc

What to do

Upgrade the Ubuntu openssl to 3.0.2-0ubuntu1.30 (package) or 3.0.13-0ubuntu3.16 (package) or 3.5.5-1ubuntu3.6 (package).

Affected software

Product	Affected	Fixed in
Ubuntu 26.10edk2`pkg:deb/ubuntu/edk2?arch=source&distro=stonking`Other threats	Affected 2025.11-3ubuntu7 – 2026.05-2ubuntu3 5 affected builds	Fixed in–
Ubuntu 26.10edk2-hwe`pkg:deb/ubuntu/edk2-hwe?arch=source&distro=stonking`Other threats	Affected 2025.11-3ubuntu8 – 2026.05-2ubuntu3 5 affected builds	Fixed in–
Ubuntu 26.04 LTSedk2`pkg:deb/ubuntu/edk2?arch=source&distro=resolute`Other threats	Affected 2025.02-8ubuntu3 – 2025.11-3ubuntu7.3 5 affected builds	Fixed in–
Ubuntu 26.04 LTSedk2-hwe`pkg:deb/ubuntu/edk2-hwe?arch=source&distro=resolute`Other threats	Affected =2025.11-3ubuntu6 =2025.11-3ubuntu8 =2025.11-3ubuntu8.2	Fixed in–
Ubuntu 26.04 LTSopenssl`pkg:deb/ubuntu/openssl?arch=source&distro=resolute`Other threats	Affected <3.5.5-1ubuntu3.6	Fixed in 3.5.5-1ubuntu3.6
Ubuntu 24.04 LTSedk2`pkg:deb/ubuntu/edk2?arch=source&distro=noble`Other threats	Affected 2023.05-2 – 2024.02-2ubuntu0.10 18 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available for this vulnerability. Users should apply the official OpenSSL updates that address this issue to prevent denial of service. No additional mitigation actions are specified or required.

Description

A vulnerability in OpenSSL's CMP client allows a NULL pointer dereference when requesting certificate revocation using a PKCS#10 CSR. This can cause the client to crash and result in a denial of service. The issue does not affect clients that identify certificates by certificate or issuer and serial number, and no FIPS modules are impacted. A patch is available to address this issue.

CWE-476NULL Pointer Dereference (opens in a new tab)
Base weaknessLikelihood of exploit: MediumCWE Top 25 (2025): #13OWASP Top 10 A10:2025: Mishandling of Exceptional Conditions (opens in a new tab)
The product dereferences a pointer that it expects to be valid but is NULL.
Implementation
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished.
Requirements
Select a programming language that is not susceptible to these issues.
Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
OWASP Cheat Sheets
Logging (opens in a new tab)
Error Handling (opens in a new tab)
OWASP ASVS 4.0.3
V11.1.7 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Oct 2026, 02:44 UTC

WeaknessesCWE-476

Technical details

References

Community reviews

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