jsonwebtoken is a JWT lib in rust. Prior to version 10.3.0, there is a Type Confusion vulnerability in jsonwebtoken, specifically, in its claim validation logic. When a standard claim (such as nbf or exp) is provided with an incorrect JSON type (Like a String instead of a Number), the library’s internal parsing mechanism marks the claim as “FailedToParse”. Crucially, the validation logic treats this “FailedToParse” state identically to “NotPresent”. This means that if a check is enabled (like: validate_nbf = true), but the claim is not explicitly marked as required in required_spec_claims, the library will skip the validation check entirely for the malformed claim, treating it as if it were not there. This allows attackers to bypass critical time-based security restrictions (like “Not Before” checks) and commit potential authentication and authorization bypasses. This issue has been patched in version 10.3.0.

The remote Fedora 42 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-6388b28850 advisory.

    - Update the time crate to version 0.3.47.
    - Update the time-macros crate to version 0.2.27.
    - Update the time-core crate to version 0.1.8.
    - Update the num-conv crate to version 0.2.0.
    - Update the git2 crate to version 0.20.4.
    - Update the bytes crate to version 1.11.1.

    Additionally, this update contains rebuilds of applications affected by security advisories:

    - bytes: [RUSTSEC-2026-0007](https://rustsec.org/advisories/RUSTSEC-2026-0007.html)
    - git2: [RUSTSEC-2026-0008](https://rustsec.org/advisories/RUSTSEC-2026-0008.html)
    - jsonwebtoken: [CVE-2026-25537](https://www.cve.org/CVERecord?id=CVE-2026-25537)
    - time: [RUSTSEC-2026-0009](https://rustsec.org/advisories/RUSTSEC-2026-0009.html)

    All applications that statically link libgit2 via the `git2` Rust bindings were also rebuilt against the     latest version of the `git2` / `libgit2-sys` crates to pull in fixes included in libgit2 between v1.8.1     and v1.9.2.



Tenable has extracted the preceding description block directly from the Fedora 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 remote Fedora 43 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-f400579a21 advisory.

    - Update the time crate to version 0.3.47.
    - Update the time-macros crate to version 0.2.27.
    - Update the time-core crate to version 0.1.8.
    - Update the num-conv crate to version 0.2.0.
    - Update the git2 crate to version 0.20.4.
    - Update the bytes crate to version 1.11.1.

    Additionally, this update contains rebuilds of applications affected by security advisories:

    - bytes: [RUSTSEC-2026-0007](https://rustsec.org/advisories/RUSTSEC-2026-0007.html)
    - git2: [RUSTSEC-2026-0008](https://rustsec.org/advisories/RUSTSEC-2026-0008.html)
    - jsonwebtoken: [CVE-2026-25537](https://www.cve.org/CVERecord?id=CVE-2026-25537)
    - time: [RUSTSEC-2026-0009](https://rustsec.org/advisories/RUSTSEC-2026-0009.html)

    All applications that statically link libgit2 via the `git2` Rust bindings were also rebuilt against the     latest version of the `git2` / `libgit2-sys` crates to pull in fixes included in libgit2 between v1.8.1     and v1.9.2.




Tenable has extracted the preceding description block directly from the Fedora 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 remote Fedora 44 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2026-1b11ddff94 advisory.

    - Update the time crate to version 0.3.47.
    - Update the time-macros crate to version 0.2.27.
    - Update the time-core crate to version 0.1.8.
    - Update the num-conv crate to version 0.2.0.
    - Update the git2 crate to version 0.20.4.
    - Update the bytes crate to version 1.11.1.

    Additionally, this update contains rebuilds of applications affected by security advisories:

    - bytes: [RUSTSEC-2026-0007](https://rustsec.org/advisories/RUSTSEC-2026-0007.html)
    - git2: [RUSTSEC-2026-0008](https://rustsec.org/advisories/RUSTSEC-2026-0008.html)
    - jsonwebtoken: [CVE-2026-25537](https://www.cve.org/CVERecord?id=CVE-2026-25537)
    - time: [RUSTSEC-2026-0009](https://rustsec.org/advisories/RUSTSEC-2026-0009.html)

    All applications that statically link libgit2 via the `git2` Rust bindings were also rebuilt against the     latest version of the `git2` / `libgit2-sys` crates to pull in fixes included in libgit2 between v1.8.1     and v1.9.2.


Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 45 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2026-fd61fd216d advisory.

    - Update the time crate to version 0.3.47.
    - Update the time-macros crate to version 0.2.27.
    - Update the time-core crate to version 0.1.8.
    - Update the num-conv crate to version 0.2.0.
    - Update the git2 crate to version 0.20.4.
    - Update the bytes crate to version 1.11.1.

    Additionally, this update contains rebuilds of applications affected by security advisories:

    - bytes: [RUSTSEC-2026-0007](https://rustsec.org/advisories/RUSTSEC-2026-0007.html)
    - git2: [RUSTSEC-2026-0008](https://rustsec.org/advisories/RUSTSEC-2026-0008.html)
    - jsonwebtoken: [CVE-2026-25537](https://www.cve.org/CVERecord?id=CVE-2026-25537)
    - time: [RUSTSEC-2026-0009](https://rustsec.org/advisories/RUSTSEC-2026-0009.html)

    All applications that statically link libgit2 via the `git2` Rust bindings were also rebuilt against the     latest version of the `git2` / `libgit2-sys` crates to pull in fixes included in libgit2 between v1.8.1     and v1.9.2.


Tenable has extracted the preceding description block directly from the Fedora 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.

  - jsonwebtoken is a JWT lib in rust. Prior to version 10.3.0, there is a Type Confusion vulnerability in     jsonwebtoken, specifically, in its claim validation logic. When a standard claim (such as nbf or exp) is     provided with an incorrect JSON type (Like a String instead of a Number), the library's internal parsing     mechanism marks the claim as FailedToParse. Crucially, the validation logic treats this FailedToParse     state identically to NotPresent. This means that if a check is enabled (like: validate_nbf = true), but     the claim is not explicitly marked as required in required_spec_claims, the library will skip the     validation check entirely for the malformed claim, treating it as if it were not there. This allows     attackers to bypass critical time-based security restrictions (like Not Before checks) and commit     potential authentication and authorization bypasses. This issue has been patched in version 10.3.0.
    (CVE-2026-25537)

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

ID	Name	Product	Family	Severity
298573	Fedora 42 : atuin / bustle / envision / glycin / greetd / helix / etc (2026-6388b28850)	Nessus	Fedora Local Security Checks	medium
298446	Fedora 43 : asciinema / atuin / bustle / envision / glycin / greetd / helix / etc (2026-f400579a21)	Nessus	Fedora Local Security Checks	medium
298323	Fedora 44 : asciinema / atuin / bustle / envision / glycin / greetd / helix / etc (2026-1b11ddff94)	Nessus	Fedora Local Security Checks	medium
298322	Fedora 45 : asciinema / atuin / bustle / envision / glycin / greetd / helix / etc (2026-fd61fd216d)	Nessus	Fedora Local Security Checks	medium
298172	Linux Distros Unpatched Vulnerability : CVE-2026-25537	Nessus	Misc.	medium

Detections

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CVE-2026-25537

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Tenable Plugins

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