5.3

CVE-2026-48525: jpadilla pyjwt Uncontrolled Resource Consumption

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-w7vc-732c-9m39PYSEC-2026-178UBUNTU-CVE-2026-48525
Published 28-05-2026Last modified 23-06-2026
Open JSON

Vulnerability summary

CVE-2026-48525 is a medium (CVSS 5.3) Uncontrolled Resource Consumption vulnerability in jpadilla pyjwt. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.4% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 9 · Related 10
OPENSUSE-SU-2026:11024-1OPENSUSE-SU-2026:21095-1SUSE-SU-2026:22138-1SUSE-SU-2026:22170-1SUSE-SU-2026:22220-1SUSE-SU-2026:22238-1

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 23-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

+0.04 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Pyjwt

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard65 products
  • airflow-2< 2.11.2-r25
  • airflow-core-2< 2.11.2-r10
  • airflow-core-3< 3.2.2-r5
  • airflow-postgres-fips-3< 3.2.2-r3
  • awx< 24.6.1-r41
Wolfi17 products
  • datadog-agent-7.72-core-integrationsAll versions (No fix recorded)
  • datadog-agent-7.73-core-integrations< 7.73.3-r23
  • datadog-agent-7.74-core-integrations< 7.74.1-r24
  • datadog-agent-7.75-core-integrationsAll versions (No fix recorded)
  • datadog-agent-7.76All versions (No fix recorded)
Debian1 product
  • pyjwtAll versions (No fix recorded) | < 2.13.0-1
Jpadilla1 product
Pyjwt_project1 product
  • pyjwt≥ 2.8.0, ≤ 2.12.1
PyPI1 product
  • pyjwt≥ 2.8.0, < 2.13.0
Ubuntu1 product
  • pyjwt< 2.7.0-1ubuntu0.2 | All versions (No fix recorded) | < 2.10.1-4ubuntu1.1

7 vendors · 87 products

References

9 links