CVE-2023-26049
A public proof of concept exists; no exploitation attested.
- Published2023-04-18
- Fixed in12.0.0.beta0 · 11.0.14 · 10.0.14 · 9.4.51 · 9.4.51.v20230217
- WeaknessCWE-200
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Jetty is a java based web server and servlet engine. Nonstandard cookie parsing in Jetty may allow an attacker to smuggle cookies within other cookies, or otherwise perform unintended behavior by tampering with the cookie parsing mechanism. If Jetty sees a cookie VALUE that starts with `"` (double quote), it will continue to read the cookie string until it sees a closing quote -- even if a semicolon is encountered. So, a cookie header such as: `DISPLAY_LANGUAGE="b; JSESSIONID=1337; c=d"` will be parsed as one cookie, with the name DISPLAY_LANGUAGE and a value of b; JSESSIONID=1337; c=d instead of 3 separate cookies. This has security implications because if, say, JSESSIONID is an HttpOnly cookie, and the DISPLAY_LANGUAGE cookie value is rendered on the page, an attacker can smuggle the JSESSIONID cookie into the DISPLAY_LANGUAGE cookie and thereby exfiltrate it. This is significant when an intermediary is enacting some policy based on cookies, so a smuggled cookie can bypass that policy yet still be seen by the Jetty server or its logging system. This issue has been addressed in versions 9.4.51, 10.0.14, 11.0.14, and 12.0.0.beta0 and users are advised to upgrade. There are no known workarounds for this issue.
Timeline
dates in UTC- 2023-04-1821:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-26049?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-26049?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV · NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 12.0 | ≥ 12.0.0alpha0, < 12.0.0.beta0 | 12.0.0.beta0 | OSV |
| 11.0 | ≥ 11.0.0, < 11.0.14 | 11.0.14 | NVD · OSV |
| 10.0 | ≥ 10.0.0, < 10.0.14 | 10.0.14 | NVD · OSV |
| 9.4 | < 9.4.51 | 9.4.51 | NVD |
| 9.4 | < 9.4.51.v20230217 | 9.4.51.v20230217 | OSV |
| 12.0 | = 12.0.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 10.0 | = 10.0 | no fix published | NVD |
| 11.0 | = 11.0 | no fix published | NVD |
| 12.0 | = 12.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | all versions | no fix published | NVD |
3 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.14 on RHEL 8 security update
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.14 on RHEL 7 security update
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.14 on RHEL 9 security update
Fix
- Update Eclipse jetty to 12.0.0.beta0 · 11.0.14 · 10.0.14 · 9.4.51 · 9.4.51.v20230217
- Vendor fix Red Hat Product Security RHSA-2023:7638 · 11 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2023:7639 · 11 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Advisories and patches
- github.comPatch
- github.comPatch
- github.comPatch · Vendor Advisory
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 1 repository, unverifieduthrasri/jetty-9.4.31.v20200723_CVE-2023-26049 PoC-in-GitHub
Sources
- CNACVSS 3.12.4read 2026-10-23
- NVDCVSS 3.15.3read 2026-10-23
- CNAweakness (CWE)CWE-200read 2026-10-23
- FIRST EPSSEPSS score1.3 %2026-10-22
- PoC-in-GitHubproof of concept1read 2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Published
- 2023-04-18
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-26049?
Is CVE-2023-26049 actively exploited?
What is the CVSS score for CVE-2023-26049?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.