NVD / CVE Program· CNA openssl

CVE-2026-63076: Invalid Pointer Dereference in CMP Server via Crafted protectionAlg

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 75.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: OpenSSL OpenSSL 3.0.22, 3.4.7, 3.5.8; azl3 edk2 20240524git3e722403cd16-18 on Azure Linux 3.0 20240524git3e722403cd16-19; azl3 edk2 20240524git3e722403cd16-20 on Azure Linux 3.0 20240524git3e722403cd16-19.

Low priority for now. Upgrade to OpenSSL OpenSSL 3.0.22, 3.4.7, 3.5.8; azl3 edk2 20240524git3e722403cd16-18 on Azure Linux 3.0 20240524git3e722403cd16-19; azl3 edk2 20240524git3e722403cd16-20 on Azure Linux 3.0 20240524git3e722403cd16-19 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Issue summary: OpenSSL CMP password based protection verification only checks whether the protectionAlg parameter was not NULL and not its ASN.1 type, before treating it as a PBMParameter. A crafted message can contain a parameter of a different type, which is then dereferenced as an invalid pointer. Impact summary: A remote, unauthenticated attacker can crash an application acting as a CMP server that accepts PBM-protected messages, or a CMP client talking to a malicious or intercepted CMP server, resulting in a Denial of Service. CWE: CWE-476: NULL Pointer Dereference Description: When verifying the password-based MAC protection of a CMP message, OpenSSL library reads the protectionAlg algorithm parameter with X509_ALGOR_get0(), which returns both the parameter type and its value pointer. The value is then cast to an ASN1_STRING and treated as the expected PBMParameter after only checking that pointer is not NULL. The parameter type returned by X509_ALGOR_get0() was never consulted. This happens during protection verification, before any MAC is computed, so no knowledge of the PBM shared secret is required; the only precondition is that PBM verification is reachable. On the server side this is reached from OSSL_CMP_SRV_process_request() for any application that stands up a CMP server accepting PBM-protected messages, and on the client side from CMP response validation against a malicious or on-path (MITM) server. The reliable consequence is a denial of service; there is no memory disclosure, no controlled memory write, and no path to code execution. CMP is a specialized feature that an application must explicitly enable. FIPS impact: no As the CMP code lives outside the FIPS module boundary, no FIPS modules are affected by this CVE.

HighCVSS 7.5 · v3.1—No exploit Fix available

Published: Aug 25, 2026
Updated: Sep 11, 2026
EPSS: 1.6% · 75th percentile
CWE: CWE-476

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 1.6%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
openssl	openssl	cpe:2.3:a:openssl:openssl

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

openssl openssl3.0.0 and later · before 3.0.22
openssl openssl3.4.0 and later · before 3.4.7
openssl openssl3.5.0 and later · before 3.5.8
openssl openssl3.6.0 and later · before 3.6.4
openssl openssl4.0.0 and later · before 4.0.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.

OpenSSL OpenSSL
- 4.0.0 and later · before 4.0.2affected · semver
- 3.6.0 and later · before 3.6.4affected · semver
- 3.5.0 and later · before 3.5.8affected · semver
- 3.4.0 and later · before 3.4.7affected · semver
- 3.0.0 and later · before 3.0.22affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:10	openssl	before 1:3.5.8-1.el10_2.alma.1	1:3.5.8-1.el10_2.alma.1
AlmaLinux:10	openssl-devel	before 1:3.5.8-1.el10_2.alma.1	1:3.5.8-1.el10_2.alma.1
AlmaLinux:10	openssl-libs	before 1:3.5.8-1.el10_2.alma.1	1:3.5.8-1.el10_2.alma.1
AlmaLinux:10	openssl-perl	before 1:3.5.8-1.el10_2.alma.1	1:3.5.8-1.el10_2.alma.1
AlmaLinux:9	openssl	before 1:3.5.8-1.el9_8	1:3.5.8-1.el9_8
AlmaLinux:9	openssl-devel	before 1:3.5.8-1.el9_8	1:3.5.8-1.el9_8
AlmaLinux:9	openssl-libs	before 1:3.5.8-1.el9_8	1:3.5.8-1.el9_8
AlmaLinux:9	openssl-perl	before 1:3.5.8-1.el9_8	1:3.5.8-1.el9_8
Alpine:v3.21	openssl	from 3.0.0 · before 3.3.7-r1	3.3.7-r1
Alpine:v3.22	openssl	from 3.0.0 · before 3.5.8-r0	3.5.8-r0
Debian:12	openssl	before 3.0.22-1~deb12u1	3.0.22-1~deb12u1
Debian:13	openssl	before 3.5.7-1~deb13u2	3.5.7-1~deb13u2
Debian:14	openssl	before 3.6.4-1	3.6.4-1
openSUSE:Leap 16.0	openssl-3	before 3.5.0-160000.10.1	3.5.0-160000.10.1
openSUSE:Tumbleweed	openssl-3	before 3.5.3-8.1	3.5.3-8.1
Red Hat:enterprise_linux:10.2	openssl	before 1:3.5.8-1.el10_2	1:3.5.8-1.el10_2
Red Hat:enterprise_linux:10.2	openssl-debuginfo	before 1:3.5.8-1.el10_2	1:3.5.8-1.el10_2
Red Hat:enterprise_linux:10.2	openssl-debugsource	before 1:3.5.8-1.el10_2	1:3.5.8-1.el10_2
Red Hat:enterprise_linux:10.2	openssl-devel	before 1:3.5.8-1.el10_2	1:3.5.8-1.el10_2
Red Hat:enterprise_linux:10.2	openssl-libs	before 1:3.5.8-1.el10_2	1:3.5.8-1.el10_2
Red Hat:enterprise_linux:10.2	openssl-libs-debuginfo	before 1:3.5.8-1.el10_2	1:3.5.8-1.el10_2
Red Hat:enterprise_linux:10.2	openssl-perl	before 1:3.5.8-1.el10_2	1:3.5.8-1.el10_2
Red Hat:enterprise_linux:9::appstream	openssl-debuginfo	before 1:3.5.8-1.el9_8	1:3.5.8-1.el9_8
Red Hat:enterprise_linux:9::appstream	openssl-debugsource	before 1:3.5.8-1.el9_8	1:3.5.8-1.el9_8

+19

Same product

openssl: all records

Other highest-scoring records for the same primary product.

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Published before and after this one in the same product

← EarlierCVE-2026-63074Aug 25, 2026 · CMP Indefinite Cache Growth of ExtraCerts
23Monitor
← EarlierCVE-2026-63075Aug 25, 2026 · QUIC ACK-only Packet Retention Can Cause Memory Exhaustion
30Monitor
Later →CVE-2026-75803Aug 25, 2026 · AEAD Forgeries with Empty Ciphertext When Using EVP_Cipher()
36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
OpenSSL OpenSSL	3.0.22	Vendor (CNA)
OpenSSL OpenSSL	3.4.7	Vendor (CNA)
OpenSSL OpenSSL	3.5.8	Vendor (CNA)
OpenSSL OpenSSL	3.6.4	Vendor (CNA)
OpenSSL OpenSSL	4.0.2	Vendor (CNA)
azl3 edk2 20240524git3e722403cd16-18 on Azure Linux 3.0	20240524git3e722403cd16-19	Microsoft (MSRC)
azl3 edk2 20240524git3e722403cd16-20 on Azure Linux 3.0	20240524git3e722403cd16-19	Microsoft (MSRC)
azl3 openssl 3.3.7-6 on Azure Linux 3.0	3.3.7-6	Microsoft (MSRC)
almalinux:openssl	1:3.5.8-1.el10_2.alma.1 · AlmaLinux:10	Package registry (OSV)
almalinux:openssl-devel	1:3.5.8-1.el10_2.alma.1 · AlmaLinux:10	Package registry (OSV)
almalinux:openssl-libs	1:3.5.8-1.el10_2.alma.1 · AlmaLinux:10	Package registry (OSV)
almalinux:openssl-perl	1:3.5.8-1.el10_2.alma.1 · AlmaLinux:10	Package registry (OSV)
alpine:openssl	3.3.7-r1 · Alpine:v3.21	Package registry (OSV)
debian:openssl	3.0.22-1~deb12u1 · Debian:12	Package registry (OSV)
opensuse:openssl-3	3.5.3-8.1 · openSUSE:Tumbleweed	Package registry (OSV)
red hat:openssl	1:3.5.8-1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:openssl-debuginfo	1:3.5.8-1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:openssl-debugsource	1:3.5.8-1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:openssl-devel	1:3.5.8-1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:openssl-libs	1:3.5.8-1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:openssl-libs-debuginfo	1:3.5.8-1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
red hat:openssl-perl	1:3.5.8-1.el10_2 · Red Hat:enterprise_linux:10.2	Package registry (OSV)
rocky linux:openssl	1:3.5.8-1.el10_2 · Rocky Linux:10	Package registry (OSV)
suse:openssl-3	3.5.0-160000.10.1 · SUSE:Linux Micro 6.2	Package registry (OSV)
suse:openssl-3-livepatches	0.6-slfo.1.1_1.1 · SUSE:Linux Micro 6.1	Package registry (OSV)
suse:openssl-3-x86_64-v3-livepatches	0.6-160000.1.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Ying Dongreporter
Bhabani Sankar Dasreporter
Daniel Kubecremediation developer

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-144570 days apartRPK Server Signature Algorithm Selection Can Dereference a Missing Certificate
30Monitor
CVE-2026-4276477 days apartNULL Pointer Dereference in QUIC Server Initial Packet Handling
30Monitor
CVE-2026-4276577 days apartNULL Dereference in Certificate Verification with OCSP Checking
30Monitor
CVE-2026-28388140 days apartNULL Pointer Dereference When Processing a Delta CRL
30Monitor
CVE-2026-28389140 days apartPossible NULL Dereference When Processing CMS KeyAgreeRecipientInfo
30Monitor
CVE-2026-28390140 days apartPossible NULL Dereference When Processing CMS KeyTransportRecipientInfo
30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:07 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/openssl/openssl/commit/37882aa2e0256e1072442a8f62f7db45b995c45b

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records