CVE-2026-42766
- Source
- https://cve.org/CVERecord?id=CVE-2026-42766
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-42766.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-42766
- Downstream
ALPINE (1)
BELL (1)
CGA (14)
DEBIAN (1)
JLSEC (1)
MGASA (1)
OESA (11)
openSUSE (2)
RHSA (10)
RLSA (2)
ROOT (1)
SUSE (15)
- Related
- Published
- 2026-06-09T16:03:26Z
- Modified
- 2026-10-16T07:22:33Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Possible NULL Dereference in Password-Based CMS Decryption
- Details
-
Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption.
Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service.
The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present.
An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service.
Applications that process password-encrypted CMS messages may be affected.
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
- Database specific
{ "cna_assigner": "openssl", "cwe_ids": [ "CWE-476" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42766.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42766.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-42766
- https://openssl-library.org/news/secadv/20260609.txt
- https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce
- https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4
- https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7
- https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4
- https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8
Affected packages
Git / github.com/openssl/openssl
Affected ranges
- Type
- GIT
- Repo
- https://github.com/openssl/openssl
- Events
-
IntroducedFixedIntroducedFixedIntroducedFixedIntroducedFixedIntroducedFixedIntroducedFixedIntroducedFixedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "range": [ { "introduced": "1.0.2" }, { "fixed": "1.0.2zq" } ], "source": "CPE_RANGE" }, { "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "range": [ { "introduced": "1.1.1" }, { "fixed": "1.1.1zh" } ], "source": "CPE_RANGE" }, { "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "range": [ { "introduced": "3.0.0" }, { "fixed": "3.0.21" } ], "source": "CPE_RANGE" }, { "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "range": [ { "introduced": "3.4.0" }, { "fixed": "3.4.6" } ], "source": "CPE_RANGE" }, { "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "range": [ { "introduced": "3.5.0" }, { "fixed": "3.5.7" } ], "source": "CPE_RANGE" }, { "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*", "range": [ { "introduced": "3.6.0" }, { "fixed": "3.6.3" } ], "source": "CPE_RANGE" }, { "cpe": "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*", "range": [ { "introduced": "4.0.0-NA" }, { "last_affected": "4.0.0-NA" } ], "source": "CPE_STRING" }, { "range": [ { "fixed": "056d06c1918fafbb98c1c85a02e4c47cc4e199ce" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "12bc26ffb3a2be728c9b86e1cae277de5b33dfa4" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "3ff64913615d648cfbb6a6f1cf5529ae7ea829d7" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "da26f368732b83e40e9d356fe61c3d3aaab6d2e8" } ], "source": "REFERENCES_COMMIT" } ] }
Affected versions
3.*
3.0-POST-CLANG-FORMAT-WEBKIT
3.0-PRE-CLANG-FORMAT-WEBKIT
3.4-POST-CLANG-FORMAT-WEBKIT
3.4-PRE-CLANG-FORMAT-WEBKIT
3.5-POST-CLANG-FORMAT-WEBKIT
3.5-PRE-CLANG-FORMAT-WEBKIT
3.6-POST-CLANG-FORMAT-WEBKIT
3.6-PRE-CLANG-FORMAT-WEBKIT
4.*
4.0.0-NA
openssl-3.*
openssl-3.0.0
openssl-3.0.1
openssl-3.0.10
openssl-3.0.11
openssl-3.0.12
openssl-3.0.13
openssl-3.0.14
openssl-3.0.15
openssl-3.0.16
openssl-3.0.17
openssl-3.0.18
openssl-3.0.19
openssl-3.0.2
openssl-3.0.20
openssl-3.0.3
openssl-3.0.4
openssl-3.0.5
openssl-3.0.6
openssl-3.0.7
openssl-3.0.8
openssl-3.0.9
openssl-3.4.0
openssl-3.4.1
openssl-3.4.2
openssl-3.4.3
openssl-3.4.4
openssl-3.4.5
openssl-3.5.0
openssl-3.5.1
openssl-3.5.2
openssl-3.5.3
openssl-3.5.4
openssl-3.5.5
openssl-3.5.6
openssl-3.6.0
openssl-3.6.1
openssl-3.6.2
openssl-4.*
openssl-4.0.0
Database specific
source
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-42766.json"
vanir_signatures
[
{
"deprecated": false,
"digest": {
"line_hashes": [
"19932538006445405886619871605822265419",
"174261661292693472232738228136053330340",
"169873427985165747128009845229956313367"
],
"threshold": 0.9
},
"id": "CVE-2026-42766-39e4c5df",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4",
"target": {
"file": "crypto/cms/cms_pwri.c"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "330992325606853768865589272126885804627",
"length": 2346
},
"id": "CVE-2026-42766-3f58ddad",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4",
"target": {
"file": "crypto/cms/cms_pwri.c",
"function": "ossl_cms_RecipientInfo_pwri_crypt"
}
},
{
"deprecated": false,
"digest": {
"line_hashes": [
"19932538006445405886619871605822265419",
"174261661292693472232738228136053330340",
"169873427985165747128009845229956313367"
],
"threshold": 0.9
},
"id": "CVE-2026-42766-586dda67",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4",
"target": {
"file": "crypto/cms/cms_pwri.c"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "178284375691898183426538972700556073091",
"length": 2407
},
"id": "CVE-2026-42766-63588065",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7",
"target": {
"file": "crypto/cms/cms_pwri.c",
"function": "ossl_cms_RecipientInfo_pwri_crypt"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "330992325606853768865589272126885804627",
"length": 2346
},
"id": "CVE-2026-42766-86db3db7",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce",
"target": {
"file": "crypto/cms/cms_pwri.c",
"function": "ossl_cms_RecipientInfo_pwri_crypt"
}
},
{
"deprecated": false,
"digest": {
"line_hashes": [
"19932538006445405886619871605822265419",
"174261661292693472232738228136053330340",
"169873427985165747128009845229956313367"
],
"threshold": 0.9
},
"id": "CVE-2026-42766-a030dfd1",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce",
"target": {
"file": "crypto/cms/cms_pwri.c"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "329591667534356058110839666717866069932",
"length": 2356
},
"id": "CVE-2026-42766-abd8d29b",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4",
"target": {
"file": "crypto/cms/cms_pwri.c",
"function": "ossl_cms_RecipientInfo_pwri_crypt"
}
},
{
"deprecated": false,
"digest": {
"line_hashes": [
"28170854778703993674264004058177114599",
"73132526844288570625317440636111911761",
"177405411499435185068645597737938634778",
"224809958623850711330610094965797758930",
"295554444428855106393106961197201359586"
],
"threshold": 0.9
},
"id": "CVE-2026-42766-c377fa22",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/e04bd3433fd84e1861bf258ea37928d9845e6a86",
"target": {
"file": "include/openssl/opensslv.h"
}
},
{
"deprecated": false,
"digest": {
"line_hashes": [
"251633914150035957322733061977107206211",
"338514574181828579838011565939158652696",
"76638288692106140328510055542557597351",
"142922657400765574308962710386922248045",
"71649992455794854055653842592139575350",
"65527166711110472566013424527579064967",
"253196866009476977787139000804413898733",
"172177136897997206866313011107384691461"
],
"threshold": 0.9
},
"id": "CVE-2026-42766-e051451f",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/e818b74be2170fbe957a07b0da4401c2b694b3b8",
"target": {
"file": "crypto/opensslv.h"
}
},
{
"deprecated": false,
"digest": {
"line_hashes": [
"19932538006445405886619871605822265419",
"174261661292693472232738228136053330340",
"169873427985165747128009845229956313367"
],
"threshold": 0.9
},
"id": "CVE-2026-42766-e7bc65f2",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7",
"target": {
"file": "crypto/cms/cms_pwri.c"
}
},
{
"deprecated": false,
"digest": {
"line_hashes": [
"19932538006445405886619871605822265419",
"174261661292693472232738228136053330340",
"169873427985165747128009845229956313367"
],
"threshold": 0.9
},
"id": "CVE-2026-42766-f114ceb6",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8",
"target": {
"file": "crypto/cms/cms_pwri.c"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "329591667534356058110839666717866069932",
"length": 2356
},
"id": "CVE-2026-42766-fd4f30cd",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8",
"target": {
"file": "crypto/cms/cms_pwri.c",
"function": "ossl_cms_RecipientInfo_pwri_crypt"
}
}
]
vanir_signatures_modified
"2026-10-16T07:22:33Z"