CVE-2026-63076
- Source
- https://cve.org/CVERecord?id=CVE-2026-63076
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-63076.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-63076
- Downstream
- Related
- Published
- 2026-08-25T13:00:11Z
- Modified
- 2026-08-30T08:06:11Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Invalid Pointer Dereference in CMP Server via Crafted protectionAlg
- Details
-
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.
- Database specific
{ "cna_assigner": "openssl", "cwe_ids": [ "CWE-476" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63076.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63076.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-63076
- https://openssl-library.org/news/secadv/20260825.txt
- https://github.com/openssl/openssl/commit/37882aa2e0256e1072442a8f62f7db45b995c45b
- https://github.com/openssl/openssl/commit/a17cc8d612ecff6d94a9b7ca8b5283ddf5ff570e
- https://github.com/openssl/openssl/commit/a1f348ccb328c3afbd4ba6883f9b7c813c043259
- https://github.com/openssl/openssl/commit/a7af46a92d0ce19a90e669ef56d2576a07924226
- https://github.com/openssl/openssl/commit/cdacfff557389abfa9e4615abded2ec984517d6c
Affected packages
Git / github.com/openssl/openssl
Affected ranges
- Type
- GIT
- Repo
- https://github.com/openssl/openssl
- Events
-
IntroducedIntroducedIntroducedIntroducedIntroducedFixedFixedFixedFixedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "4.0.0" }, { "fixed": "4.0.2" }, { "introduced": "3.6.0" }, { "fixed": "3.6.4" }, { "introduced": "3.5.0" }, { "fixed": "3.5.8" }, { "introduced": "3.4.0" }, { "fixed": "3.4.7" }, { "introduced": "3.0.0" }, { "fixed": "3.0.22" } ], "source": [ "AFFECTED_FIELD", "REFERENCES" ] }
Affected versions
3.*
openssl-3.*
openssl-4.*
Database specific
source
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-63076.json"
vanir_signatures
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},
"id": "CVE-2026-63076-6da1632b",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/a1f348ccb328c3afbd4ba6883f9b7c813c043259",
"target": {
"file": "crypto/cmp/cmp_protect.c",
"function": "ossl_cmp_calc_protection"
}
},
{
"deprecated": false,
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],
"threshold": 0.9
},
"id": "CVE-2026-63076-81bd0ce4",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/a17cc8d612ecff6d94a9b7ca8b5283ddf5ff570e",
"target": {
"file": "crypto/cmp/cmp_protect.c"
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},
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"source": "https://github.com/openssl/openssl/commit/37882aa2e0256e1072442a8f62f7db45b995c45b",
"target": {
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},
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"digest": {
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"source": "https://github.com/openssl/openssl/commit/37882aa2e0256e1072442a8f62f7db45b995c45b",
"target": {
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},
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"digest": {
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},
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"source": "https://github.com/openssl/openssl/commit/a17cc8d612ecff6d94a9b7ca8b5283ddf5ff570e",
"target": {
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"function": "ossl_cmp_calc_protection"
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},
{
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"digest": {
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"threshold": 0.9
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"id": "CVE-2026-63076-d05c2c80",
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"source": "https://github.com/openssl/openssl/commit/a1f348ccb328c3afbd4ba6883f9b7c813c043259",
"target": {
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}
}
]
vanir_signatures_modified
"2026-08-30T08:06:11Z"