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Vulnerabilities

Vulnerability · USN-8916-1

pyjwt vulnerabilities

Published Oct 13, 2026 · catalog updated Oct 14, 2026 · pyjwt vulnerabilities

Open the advisory

Exploitation likelihood is not on this record for USN-8916-1. A missing EPSS score is not a low risk. Compare pyjwt vulnerabilities with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (pyjwt vulnerabilities).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
Ubuntu:22.04:LTS pyjwt · Ubuntu:24.04:LTS pyjwt · Ubuntu:26.04:LTS pyjwt · Ubuntu:Pro:16.04:LTS pyjwt · Ubuntu:Pro:18.04:LTS pyjwt · Ubuntu:Pro:20.04:LTS pyjwt

YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC verification. An attacker could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-102266) Rohan Das discovered that PyJWT incorrectly handled redirects when fetching key sets. A remote attacker could possibly use this issue to cause PyJWT to disclose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS. (CVE-2026-102267) It was discovered that PyJWT incorrectly recognized certain PEM representations. An attacker who knew the public key could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS. (CVE-2026-102268) Nuno Lopes discovered that PyJWT incorrectly handled DER public keys when performing HMAC verification. An attacker who knew the public key could possibly use this issue to forge authentication tokens. (CVE-2026-102271) It was discovered that PyJWT did not properly handle certain JWK keys prefixed with a byte-order mark. An attacker who knew the public key could possibly use this issue to forge authentication tokens. (CVE-2026-102272) Charles Vosburgh discovered that PyJWT incorrectly handled certain JWK containers when performing HMAC verification. An attacker who knew the public key could possibly use this issue to forge authentication tokens. (CVE-2026-102273)

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Ubuntu:22.04:LTS pyjwt0 → 2.3.0-1ubuntu0.5
  • Ubuntu:24.04:LTS pyjwt0 → 2.7.0-1ubuntu0.3
  • Ubuntu:26.04:LTS pyjwt0 → 2.10.1-4ubuntu1.2
  • Ubuntu:Pro:16.04:LTS pyjwt0 → 1.3.0-1ubuntu0.1+esm3
  • Ubuntu:Pro:18.04:LTS pyjwt0 → 1.5.3+ds1-1ubuntu0.1+esm3
  • Ubuntu:Pro:20.04:LTS pyjwt0 → 1.7.1-2ubuntu2.1+esm3

How to fix USN-8916-1

  • Recommended remediation

    A patch or advisory reference is linked. Open the original publisher for availability by product version.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for USN-8916-1. A missing EPSS score is not a low risk. Compare pyjwt vulnerabilities with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 2.3.0-1ubuntu0.5, 0 → 2.7.0-1ubuntu0.3, 0 → 2.10.1-4ubuntu1.2, 0 → 1.3.0-1ubuntu0.1+esm3, 0 → 1.5.3+ds1-1ubuntu0.1+esm3, 0 → 1.7.1-2ubuntu2.1+esm3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC verification. An attacker could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-102266) Rohan Das discovered that PyJWT incorrectly handled redirects when fetching key sets. A remote attacker could possibly use this issue to cause PyJWT to di

  2. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    pyjwt fixed in 1.3.0-1ubuntu0.1+esm3; pyjwt fixed in 1.5.3+ds1-1ubuntu0.1+esm3; pyjwt fixed in 1.7.1-2ubuntu2.1+esm3; pyjwt fixed in 2.3.0-1ubuntu0.5

  3. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    pyjwt fixed in 1.3.0-1ubuntu0.1+esm3

  4. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    pyjwt fixed in 1.5.3+ds1-1ubuntu0.1+esm3

  5. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    pyjwt fixed in 1.7.1-2ubuntu2.1+esm3

  6. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    pyjwt fixed in 2.3.0-1ubuntu0.5

  7. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    pyjwt fixed in 2.7.0-1ubuntu0.3

  8. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    pyjwt fixed in 2.10.1-4ubuntu1.2

  9. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    YuSung Han discovered that PyJWT did not properly validate certain JWK keys when performing HMAC verification. An attacker could possibly use this issue to forge authentication tokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-102266) Rohan Das discovered that PyJWT incorrectly handled redirects when fetching key sets. A remote attacker could possibly use this issue to cause PyJWT to di

Sources

References

Freshness

Last verified in this catalog Oct 14, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.