7.4

CVE-2026-45300: asynchttpclient_project async-http-client

CVSS: 7.4v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-45300DEBIAN-CVE-2026-45300CGA-3gxv-m9hj-f82v
Published 05-06-2026Last modified 08-06-2026
Open JSON

Vulnerability summary

CVE-2026-45300 is a high (CVSS 7.4) vulnerability in asynchttpclient_project async-http-client. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.46%
0%100%
Low · +0.14 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-F637-MJQX-FV22

Timeline

  1. 05-06-2026
    PublishedVulnerability first disclosed.
  2. 08-06-2026
    Last modifiedVulnerability information updated.

Description

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Versions on the 2.x branch prior to 2.15.0 and the 3.x branch prior to 3.0.10 leak `Cookie` headers to cross-origin redirect targets. When following a redirect to a different origin, the `propagatedHeaders()` method in `Redirect30xInterceptor.java` strips `Authorization` and `Proxy-Authorization` headers but does not strip the `Cookie` header, causing session cookies and other sensitive cookie values to be sent to attacker-controlled servers. Versions 2.15.0 and 3.0.10 patch the issue.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

+0.14 pp

From 0.32% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.46%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Async Http Client

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard10 products
  • apache-pulsar-4.0< 4.0.10-r2
  • apache-pulsar-4.1< 4.1.3-r16
  • apache-pulsar-4.2< 4.2.1-r5
  • apache-pulsar-fips-4.0< 4.0.9-r18
  • apache-pulsar-fips-4.1< 4.1.3-r13
Wolfi4 products
  • apache-pulsar-4.1< 4.1.3-r16
  • apache-pulsar-4.2< 4.2.1-r5
  • druid< 37.0.0-r9
  • tez< 0.10.5-r13
Asynchttpclient1 product
Asynchttpclient_project1 product
Debian1 product
  • async-http-clientAll versions (No fix recorded)
Org.asynchttpclient1 product
  • async-http-client≥ 3.0.0.Beta1, < 3.0.10 | ≥ 2.0.0, < 2.15.0
Ubuntu1 product
  • async-http-clientAll versions (No fix recorded)

7 vendors · 19 products

References

9 links