Description
PyJWT is a JSON Web Token implementation in Python. From 2.8.0 to 2.12.1, when verifying detached JWS tokens using the unencoded-payload option ("b64": false, RFC 7797), PyJWT performs Base64URL decoding of the compact-serialization payload segment before enforcing the detached-payload rules. For b64=false, PyJWT later discards that decoded payload and replaces it with the caller-provided detached_payload. In practice, this turns the middle segment into an attacker-controlled “work amplifier”: a remote client can supply an arbitrarily large Base64URL payload segment that forces CPU work + memory allocations even if the signature is invalid. This creates an unauthenticated DoS vector against any endpoint that verifies detached JWS using PyJWT. This vulnerability is fixed in 2.13.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| jpadilla | pyjwt | >= 2.8.0, < 2.13.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pyjwt | 2.13.0-1 | — |
| Debian 13 | pyjwt | No fix yet | — |
| Debian 12 | pyjwt | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | pyjwt | 2.10.1-4ubuntu1.1 | USN-8823-1 |
| Ubuntu 25.10 | pyjwt | No fix yet | — |
| Ubuntu 24.04 LTS | pyjwt | 2.7.0-1ubuntu0.2 | USN-8823-1 |
| Ubuntu 22.04 LTS | pyjwt | 2.3.0-1ubuntu0.4 | USN-8823-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | pyjwt | 1.7.1-2ubuntu2.1+esm2 | USN-8823-1 |
| Ubuntu Pro 18.04 LTS | pyjwt | 1.5.3+ds1-1ubuntu0.1+esm2 | USN-8823-1 |
| Ubuntu Pro 16.04 LTS | pyjwt | 1.3.0-1ubuntu0.1+esm2 | USN-8823-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1 |
| SLES 15 SP6 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
| SLES 15 SP5 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
| SLES 15 SP4 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
| SLES 3 | python-PyJWT | 2.8.0-150400.8.13.1 | SUSE-SU-2026:2626-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | python-PyJWT | 2.12.1-160000.2.1 | SUSE-SU-2026:22170-1 |
| SLES for SAP 15 SP6 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
| SLES for SAP 15 SP5 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
| SLES for SAP 15 SP4 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
| SLES 16.0 | python-PyJWT | 2.12.1-160000.2.1 | SUSE-SU-2026:22170-1 |
| SLE Micro 6.2 | python-PyJWT | 2.12.1-160000.2.1 | SUSE-SU-2026:22220-1 |
| SLE Micro 6.1 | python-PyJWT | 2.12.1-slfo.1.1_2.1 | SUSE-SU-2026:22138-1 |
| SLE Micro 6.0 | python-PyJWT | 2.9.0-3.1 | SUSE-SU-2026:22238-1 |
| SLE Micro 5.5 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1 |
| SLE HPC 15 SP5 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
| SLE HPC 15 SP4 | python-PyJWT | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1, SUSE-SU-2026:2626-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-PyJWT | 2.13.0-1.1 | openSUSE-SU-2026:11024-1 |
| openSUSE Leap 16.0 | python-PyJWT | 2.12.1-160000.2.1 | openSUSE-SU-2026:21095-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | python3-jwt +1 | 2.4.0-1.amzn2023.0.5 | ALAS2023-2026-2051 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | python-jwt | 2.13.0-1 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | datadog-agent-7.72-core-integrations | No fix yet | — |
| Wolfi rolling | datadog-agent-7.73-core-integrations | 7.73.3-r23 | — |
| Wolfi rolling | datadog-agent-7.77-core-integrations | 7.77.3-r16 | — |
| Wolfi rolling | datadog-agent-7.78-core-integrations | 7.78.4-r10 | — |
| Wolfi rolling | datadog-agent-7.79-core-integrations | 7.79.2-r6 | — |
| Wolfi rolling | datadog-agent-7.80-core-integrations | 7.80.4-r3 | — |
| Wolfi rolling | ggshield | 1.52.2-r1 | — |
| Wolfi rolling | kserve +1 | 0.20.0-r7 | — |
| Wolfi rolling | kserve-storage-controller | 0.19.0-r2 | — |
| Wolfi rolling | superset-6.0 | 6.0.0-r17 | — |
| Wolfi rolling | superset-6.1 | 6.1.0-r2 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | pyjwt | >= 2.8.0, < 2.13.0 | 2.13.0 | GHSA-w7vc-732c-9m39 |
Advisories 10
- USN-8823-1 pyjwt vulnerabilities Ubuntu Security Notices (USN) · Sep 28, 2026
- ALAS2023-2026-2051 Moderate: python-jwt security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 17, 2026
- openSUSE-SU-2026:21095-1 Security update for python-PyJWT SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22238-1 Security update for python-PyJWT SUSE / openSUSE Security Updates · Jun 26, 2026
- SUSE-SU-2026:2626-1 Security update for python-PyJWT SUSE / openSUSE Security Updates · Jun 26, 2026
- SUSE-SU-2026:2627-1 Security update for python-PyJWT SUSE / openSUSE Security Updates · Jun 26, 2026
- SUSE-SU-2026:22220-1 Security update for python-PyJWT SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:22170-1 Security update for python-PyJWT SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:22138-1 Security update for python-PyJWT SUSE / openSUSE Security Updates · Jun 18, 2026
- openSUSE-SU-2026:11024-1 python311-PyJWT-2.13.0-1.1 on GA media SUSE / openSUSE Security Updates · Jun 14, 2026