CVE-2026-22795: Missing ASN1_TYPE validation in PKCS#12 parsing
Vulnerability summary
CVE-2026-22795 is a medium (CVSS 5.5) vulnerability in openssl. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.4% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 23 · Related 19Timeline
- 27-01-2026PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
Issue summary: An invalid or NULL pointer dereference can happen in an application processing a malformed PKCS#12 file. Impact summary: An application processing a malformed PKCS#12 file can be caused to dereference an invalid or NULL pointer on memory read, resulting in a Denial of Service. A type confusion vulnerability exists in PKCS#12 parsing code where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid pointer read. The location is constrained to a 1-byte address space, meaning any attempted pointer manipulation can only target addresses between 0x00 and 0xFF. This range corresponds to the zero page, which is unmapped on most modern operating systems and will reliably result in a crash, leading only to a Denial of Service. Exploiting this issue also requires a user or application to process a maliciously crafted PKCS#12 file. It is uncommon to accept untrusted PKCS#12 files in applications as they are usually used to store private keys which are trusted by definition. For these reasons, the issue was assessed as Low severity. The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the PKCS12 implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue. OpenSSL 1.0.2 is not affected by this issue.
CVSS metrics
7 scores · 7 sources · 1 version- OSV · AlpineEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.17% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard10 products
- libcrypto3-2.34< 3.6.1-r0
- openssl< 3.6.1-r0
- openssl-3.5< 3.5.5-r0
- openssl-3.5-libcrypto< 3.5.5-r0
- openssl-3.5-libssl< 3.5.5-r0
Ubuntu3 products
- nodejsAll versions (No fix recorded)
- openssl< 1.1.1-1ubuntu2.1~18.04.23+esm7 | < 1.1.1-1ubuntu2.fips.2.1~18.04.23.7 | All versions (No fix recorded) | < 1.1.1f-1ubuntu2.24+esm2 | < 1.1.1f-1ubuntu2.fips.24.2 | < 3.0.2-0ubuntu1.21 | < 3.0.2-0ubuntu1.21+Fips1 | < 3.0.13-0ubuntu3.7 | < 3.5.3-1ubuntu3 | < 3.5.5-1ubuntu1
- openssl-fipsAll versions (No fix recorded) | < 3.0.13-0ubuntu3.12+Fips1
Alpine1 product
- openssl≥ 1.1.1, < 3.0.19-r0 | ≥ 1.1.1, < 3.3.6-r0 | ≥ 1.1.1, < 3.5.5-r0
Debian1 product
- openssl< 3.0.18-1~deb12u2 | < 3.5.4-1~deb13u2 | < 3.5.5-1
Openssl1 product
- openssl≥ 3.6.0, < 3.6.1 | ≥ 3.5.0, < 3.5.5 | ≥ 3.4.0, < 3.4.4 | ≥ 3.3.0, < 3.3.6 | ≥ 3.0.0, < 3.0.19 | ≥ 1.1.1, < 1.1.1ze
Wolfi1 product
- openssl< 3.6.1-r0
6 vendors · 17 products
