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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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)

The Rocky Linux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1784038553 advisory.

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

The AlmaLinux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1784038553 advisory.

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

The AlmaLinux 9.2 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1784899428 advisory.

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

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4709 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4709-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     July 31, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : poppler     Version        : 20.09.0-3.1+deb11u3 22.12.0-2+deb12u3     CVE ID         : CVE-2025-43718 CVE-2025-43903 CVE-2025-50420 CVE-2025-52885                      CVE-2025-52886 CVE-2026-10118     Debian Bug     : 1103545 1108784 1110463 1117046 1117853 1138708

    Multiple vulnerabilities were discovered in poppler, a PDF rendering     library, which could result in signature forgery, information     disclosure, denial of service, or potentially the execution of arbitrary     code.

    The following security issues have been identified (and fixed) in poppler     as shipped in Debian bullseye and Debian bookworm.

    CVE-2025-43903

        It was discovered signatures with non-empty encapsulated content         (typically adbe.pkcs7.sha1) were not correctly verified, thereby         allowing trivial signature forgery.

    CVE-2025-50420

        An infinite recursion issue was discovered in the pdfseparate(1)         utility, which may cause denial of service via crafted PDF input         file.

    CVE-2025-52886

        Kevin Backhouse discovered an integer overflow issue, which may lead         to use-after-free via crafted PDF input file.

    For Debian 12 bookworm, these problems have been fixed in version     22.12.0-2+deb12u3.

    In addition, the following issues have been fixed in the poppler version     as shipped in Debian bullseye (for bookworm, these issues were already     fixed in 22.12.0-2+deb12u2 from DSA-6334-1):

    CVE-2025-43718

        It was discovered that crafted PDF files containing deeply nested         structures within the metadata could lead to Denial of Service.

    CVE-2025-52885

        Antonio Morales discovered a use-after-free issue, which may lead to         arbitrary code execution via crafted PDF input files.

    CVE-2026-10118

        An integer overflow issue was discovered in tilingPatternFill, which         may lead to arbitrary code execution via crafted PDF input files.

    For Debian 11 bullseye, these problems have been fixed in version     20.09.0-3.1+deb11u3.

    We recommend that you upgrade your poppler packages.

    For the detailed security status of poppler please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/poppler

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

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

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-993337 advisory.

    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 Unity 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 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	Type	Severity
459315	Echo: poppler: security update to 25.03.0-4	Tenable Cloud Security	Echo Local Security Checks	Local	low
459315	Echo: poppler: security update to 25.03.0-4	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	low
360347	Rocky Linux 9.6 [TuxCare] Security Update: poppler / poppler-cpp / poppler-cpp-devel / poppler-devel / etc (ALMALINUX9.6:CLSA-2026:1784038553)	Nessus	Rocky Linux Local Security Checks	Local	low
359855	AlmaLinux 9.6 [TuxCare] Security Update: poppler / poppler-cpp / poppler-cpp-devel / poppler-devel / etc (ALMALINUX9.6:CLSA-2026:1784038553)	Nessus	Alma Linux Local Security Checks	Local	low
352719	AlmaLinux 9.2 [TuxCare] Security Update: poppler / poppler-cpp / poppler-cpp-devel / poppler-devel / etc (ALMALINUX9.2:CLSA-2026:1784899428)	Nessus	Alma Linux Local Security Checks	Local	low
331517	Debian dla-4709 : gir1.2-poppler-0.18 - security update	Nessus	Debian Local Security Checks	Local	high
281069	Unity Linux 20.1070e Security Update: poppler (UTSA-2025-993337)	Nessus	Unity Linux Local Security Checks	Local	low
275956	TencentOS Server 4: poppler (TSSA-2025:0636)	Nessus	Tencent Local Security Checks	Local	low
257497	Linux Distros Unpatched Vulnerability : CVE-2025-43903	Nessus	Misc.	Local	low
235095	SUSE SLED15: libpoppler-cpp0 / libpoppler-cpp0-32bit / libpoppler-devel / etc (SUSE-SU-2025:1434-1)	Nessus	SuSE Local Security Checks	Local	low
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	Local	medium

Detections

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CVE-2025-43903

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Tenable Plugins

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