OESA-2026-2750

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-2750
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-2750.json
JSON Data
https://api.test.osv.dev/v1/vulns/OESA-2026-2750
Upstream
Published
2026-06-24T11:11:40Z
Modified
2026-08-18T01:20:41Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
shim security update
Details

Initial UEFI bootloader that handles chaining to a trusted full \ bootloader under secure boot environments.

Security Fix(es):

Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms.

Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1 elements would instead be truncated.

An integer truncation in OpenSSL's ASN.1 decoder causes the content length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly causing OpenSSL to read either less than or beyond the end of the allocated buffer.

Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected. OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not 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.(CVE-2026-34180)

Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification.

Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution.

When processing a PKCS#7 or S/MIME signed message, if the SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-after-free condition.

In the common case this occurs when the application later calls BIO_free() on the BIO originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage patterns, this may result in a crash or other memory corruption. In some application contexts this may potentially be exploitable for remote code execution.

Applications that process PKCS#7 or S/MIME signed messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this processing are not 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.(CVE-2026-45447)

Issue summary: A signed integer overflow when sizing the destination buffer for Unicode output in ASN1_mbstring_ncopy() can lead to a heap buffer overflow.

Impact summary: A heap buffer overflow may lead to a crash or possibly attacker controlled code execution or other undefined behaviour.

In ASN1_mbstring_copy() and ASN1_mbstring_ncopy() the destination size for Unicode output is computed in a signed int: by left shift of the input character count for BMPSTRING (UTF-16) and UNIVERSALSTRING (UTF-32), and by summing per-character byte counts for UTF8STRING. The calculation overflows when the input reaches around 2^30 characters. In the worst case (UNIVERSALSTRING at 2^30 characters) the size wraps to zero, OPENSSL_malloc(1) is called, and the subsequent character copy writes several gigabytes past the one-byte allocation.

X.509 certificate processing routes through ASN1_STRING_set_by_NID(), whose DIRSTRING_TYPE mask excludes UNIVERSALSTRING and whose per-NID size limits cap the input length; no network protocol or certificate-handling path in OpenSSL exercises the overflow. Triggering the bug requires an application that calls ASN1_mbstring_copy() or ASN1_mbstring_ncopy() directly, or registers a custom string type via ASN1_STRING_TABLE_add(), with attacker-controlled input on the order of half a gigabyte or more. For these reasons this issue was assigned Low severity.

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.(CVE-2026-7383)

Database specific 
{
    "severity": "High"
}
References

Affected packages

openEuler:24.03-LTS-SP3 / shim

Package

Name
shim
Purl
pkg:rpm/openEuler/shim&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
15.7-27.oe2403sp3

Ecosystem specific 

{
    "aarch64": [
        "shim-15.7-27.oe2403sp3.aarch64.rpm",
        "shim-debuginfo-15.7-27.oe2403sp3.aarch64.rpm",
        "shim-debugsource-15.7-27.oe2403sp3.aarch64.rpm",
        "shim-signed-15.7-27.oe2403sp3.aarch64.rpm"
    ],
    "src": [
        "shim-15.7-27.oe2403sp3.src.rpm"
    ],
    "x86_64": [
        "shim-15.7-27.oe2403sp3.x86_64.rpm",
        "shim-debuginfo-15.7-27.oe2403sp3.x86_64.rpm",
        "shim-debugsource-15.7-27.oe2403sp3.x86_64.rpm",
        "shim-signed-15.7-27.oe2403sp3.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2750.json"

openEuler:20.03-LTS-SP4 / shim

Package

Name
shim
Purl
pkg:rpm/openEuler/shim&distro=openEuler-20.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
15-42.oe2003sp4

Ecosystem specific 

{
    "aarch64": [
        "shim-15-42.oe2003sp4.aarch64.rpm"
    ],
    "noarch": [
        "shim-debuginfo-15-42.oe2003sp4.noarch.rpm",
        "shim-debugsource-15-42.oe2003sp4.noarch.rpm"
    ],
    "src": [
        "shim-15-42.oe2003sp4.src.rpm"
    ],
    "x86_64": [
        "shim-15-42.oe2003sp4.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2750.json"

openEuler:22.03-LTS-SP4 / shim

Package

Name
shim
Purl
pkg:rpm/openEuler/shim&distro=openEuler-22.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
15.6-31.oe2203sp4

Ecosystem specific 

{
    "aarch64": [
        "shim-15.6-31.oe2203sp4.aarch64.rpm",
        "shim-debuginfo-15.6-31.oe2203sp4.aarch64.rpm",
        "shim-debugsource-15.6-31.oe2203sp4.aarch64.rpm"
    ],
    "src": [
        "shim-15.6-31.oe2203sp4.src.rpm"
    ],
    "x86_64": [
        "shim-15.6-31.oe2203sp4.x86_64.rpm",
        "shim-debuginfo-15.6-31.oe2203sp4.x86_64.rpm",
        "shim-debugsource-15.6-31.oe2203sp4.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2750.json"

openEuler:24.03-LTS-SP1 / shim

Package

Name
shim
Purl
pkg:rpm/openEuler/shim&distro=openEuler-24.03-LTS-SP1

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
15.7-27.oe2403sp1

Ecosystem specific 

{
    "aarch64": [
        "shim-15.7-27.oe2403sp1.aarch64.rpm",
        "shim-debuginfo-15.7-27.oe2403sp1.aarch64.rpm",
        "shim-debugsource-15.7-27.oe2403sp1.aarch64.rpm",
        "shim-signed-15.7-27.oe2403sp1.aarch64.rpm"
    ],
    "src": [
        "shim-15.7-27.oe2403sp1.src.rpm"
    ],
    "x86_64": [
        "shim-15.7-27.oe2403sp1.x86_64.rpm",
        "shim-debuginfo-15.7-27.oe2403sp1.x86_64.rpm",
        "shim-debugsource-15.7-27.oe2403sp1.x86_64.rpm",
        "shim-signed-15.7-27.oe2403sp1.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2750.json"