EUVD-2026-50204
GHSA-3mm3-f2hp-jpcj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/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
Network-reachable HPACK/XPACK parser requires precisely crafted integer encoding (AC:H); no authentication needed; impact is crash-only with no confidentiality or integrity exposure.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/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
Lifecycle Timeline
3DescriptionCVE.org
Apache Traffic Server mishandles integers while decoding HPACK/XPACK headers, corrupting memory.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
AnalysisAI
Memory corruption in Apache Traffic Server during HPACK/XPACK header decoding exposes affected deployments to denial of service. Versions spanning the 8.x, 9.x, and 10.x release lines are affected, with unauthenticated remote attackers able to craft malformed compressed headers that trigger an integer overflow (CWE-190), corrupting server memory. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires Apache Traffic Server to be running a vulnerable version (8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3) with HTTP/2 or HTTP/3 (QUIC) protocol support enabled and accessible from the attacker's network position. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.9 (Medium) is consistent with the available signals. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker sends a crafted HTTP/2 request containing a malformed HPACK header block in which an integer field is encoded to produce an overflow when decoded by Apache Traffic Server. The corrupted integer propagates into memory allocation or buffer indexing logic, corrupting the ATS process heap and causing a crash, taking down the proxy or cache service. … |
| Remediation | Upgrade Apache Traffic Server to version 9.2.15 or 10.1.4, both of which are confirmed by the vendor as fixing this issue per the advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Apache Traffic Server
View allRemote denial of service in Apache Traffic Server (8.0.0-8.1.9, 9.0.0-9.2.14, 10.0.0-10.1.3) allows unauthenticated atta
Out-of-bounds write and integer overflow in Apache Traffic Server's MIME and HTTP header parsing lets remote attackers c
Request smuggling and policy bypass in Apache Traffic Server (branches 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) ari
Denial of service in Apache Traffic Server 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3 lets remote unauthenticated atta
Out-of-bounds write and limit-bypass flaws in several experimental plugins shipped with Apache Traffic Server (8.0.0-8.1
Improper certificate generation in the Apache Traffic Server certifier plugin lets remote attackers dictate the contents
Memory corruption in Apache Traffic Server's remap configuration handling lets remote attackers trigger a use-after-free
Denial-of-service and cache-integrity corruption in Apache Traffic Server (8.0.0-8.1.9, 9.0.0-9.2.14, 10.0.0-10.1.3) all
Out-of-bounds memory write in the Apache Traffic Server header_rewrite plugin allows remote attackers to crash the proxy
Memory corruption in the Cripts scripting framework of Apache Traffic Server (versions 10.0.0 through 10.1.3) allows rem
Denial of service in Apache Traffic Server (versions 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) arises from a stack-b
Denial of service in the Apache Traffic Server ESI (Edge Side Includes) plugin allows remote unauthenticated attackers t
Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today