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CVE-2026-107280

MEDIUM 6.9

Published 2026-10-07 · Last modified 2026-10-08

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 18th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

6.9CVSS 4.0 · MEDIUM

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup
  • ⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Asynchttpclient

Products Async Http Client

Weakness (CWE)

  • CWE-1275: : Sensitive Cookie with Improper SameSite Attribute

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • org.asynchttpclient:async-http-client Maven

    pkg:maven/org.asynchttpclient/async-http-client

    ECOSYSTEM range
    • Introduced version (included): 3.0.0
    • Fixed boundary (excluded): 3.0.13
    13 explicitly listed affected versions

    3.0.0, 3.0.1, 3.0.10, 3.0.11, 3.0.12, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9

    Additional upstream package constraints
    {
  "database": {
    "last_known_affected_version_range": "<= 3.0.12",
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-f9m8-cv68-674w/GHSA-f9m8-cv68-674w.json"
  }
}
    GitHub Advisory Database · GHSA-f9m8-cv68-674w · Updated 2026-10-08T16:45:19.478132339Z
  • org.asynchttpclient:async-http-client Maven

    pkg:maven/org.asynchttpclient/async-http-client

    ECOSYSTEM range
    • Introduced version (included): 2.0.0
    • Fixed boundary (excluded): 2.16.1
    112 explicitly listed affected versions

    2.0.0, 2.0.1, 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.0.15, 2.0.16, 2.0.17, 2.0.18, 2.0.19, 2.0.2, 2.0.20, 2.0.21, 2.0.22, 2.0.23, 2.0.24, 2.0.25, 2.0.26, 2.0.27, 2.0.28, 2.0.29, 2.0.3, 2.0.30, 2.0.31, 2.0.32, 2.0.33, 2.0.34, 2.0.35, 2.0.36, 2.0.37, 2.0.38, 2.0.39, 2.0.4, 2.0.40, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.1.0, 2.1.0-RC1, 2.1.0-RC2, 2.1.0-RC3, 2.1.0-RC4, 2.1.0-alpha1, 2.1.0-alpha10, 2.1.0-alpha11, 2.1.0-alpha12, 2.1.0-alpha13, 2.1.0-alpha14, 2.1.0-alpha15, 2.1.0-alpha16, 2.1.0-alpha17, 2.1.0-alpha18, 2.1.0-alpha19, 2.1.0-alpha2, 2.1.0-alpha20, 2.1.0-alpha21, 2.1.0-alpha22, 2.1.0-alpha23, 2.1.0-alpha24, 2.1.0-alpha25, 2.1.0-alpha26, 2.1.0-alpha3, 2.1.0-alpha4, 2.1.0-alpha5, 2.1.0-alpha6, 2.1.0-alpha7, 2.1.0-alpha8, 2.1.0-alpha9, 2.1.1, 2.1.2, 2.10.0, 2.10.1, 2.10.2, 2.10.3, 2.10.4, 2.10.5, 2.11.0, 2.12.0, 2.12.1, 2.12.2, 2.12.3, 2.12.4, 2.14.5, 2.15.0, 2.16.0, 2.2.0, 2.2.1, 2.3.0, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.4.7, 2.4.8, 2.4.9, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.6.0, 2.7.0, 2.8.0, 2.8.1, 2.9.0

    Additional upstream package constraints
    {
  "database": {
    "last_known_affected_version_range": "<= 2.16.0",
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-f9m8-cv68-674w/GHSA-f9m8-cv68-674w.json"
  }
}
    GitHub Advisory Database · GHSA-f9m8-cv68-674w · Updated 2026-10-08T16:45:19.478132339Z

All CVSS metrics

  • MEDIUM 6.9 v4.0 · CNA Primary
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
  • MEDIUM 6.9 v4.0 · NVD Secondary
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS