NSSCryptoSignBackend.cc in Poppler before 25.04.0 does not verify the adbe.pkcs7.sha1 signatures on documents, resulting in potential signature forgeries.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2025:0636 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2025-43903:
    NSSCryptoSignBackend.cc in Poppler before 25.04.0 does not verify the adbe.pkcs7.sha1 signatures on     documents, resulting in potential signature forgeries.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - NSSCryptoSignBackend.cc in Poppler before 25.04.0 does not verify the adbe.pkcs7.sha1 signatures on     documents, resulting in potential signature forgeries. (CVE-2025-43903)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:1434-1 advisory.

    - CVE-2025-43903: improper verification of adbe.pkcs7.sha1 signatures allows for signature forgeries.
    (bsc#1241620)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 host has packages installed that are affected by a vulnerability as referenced in the USN-7471-1 advisory.

    It was discovered that poppler did not properly verify adbe.pkcs7.sha1 signatures in PDF documents. An     attacker could possibly use this issue to create documents with forged signatures that are treated as     legitimately signed.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
275956	TencentOS Server 4: poppler (TSSA-2025:0636)	Nessus	Tencent Local Security Checks	low
257497	Linux Distros Unpatched Vulnerability : CVE-2025-43903	Nessus	Misc.	medium
235095	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : poppler (SUSE-SU-2025:1434-1)	Nessus	SuSE Local Security Checks	medium
234994	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : poppler vulnerabilities (USN-7471-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2025-43903

low

Tenable Plugins

low

medium

medium

medium