CVE-2023-26049 [Low] | Information Disclosure in Jetty

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.37%	1.30%	+0.93%
2	2026-05-19	0.33%	0.37%	+0.05%
3	2026-01-16	—	0.33%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.37%

1.30%

+0.93%

2026-05-19

0.33%

0.37%

+0.05%

2026-01-16

—

0.33%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
2.4	3.1	LOW	`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	0.9	1.4	[email protected]
5.3	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	3.9	1.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

2.4

3.1

LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

0.9

1.4

[email protected]

5.3

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

3.9

1.4

[email protected]

OS Trackers for CVE-2023-26049

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-26049 not yet assigned priority: Debian including 1 source packages (jetty9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2023-26049
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2023-26049
`suse`	low	CVE-2023-26049 severity low: SUSE including 58 source package names (jetty-annotations-9.4.51-1.1, jetty-annotations-9.4.51-150200.3.19.2, …), 185 product×package rows across 14 product lines (Image server-image, SUSE Linux Enterprise Module for Development Tools 15 SP4, … (14 product lines)): Fixed 185.	https://www.suse.com/security/cve/CVE-2023-26049/
`ubuntu`	medium	CVE-2023-26049 medium priority: Ubuntu including 1 source packages (jetty), 13 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 10, needed 2, needs-triage 1.	https://ubuntu.com/security/CVE-2023-26049

Affected software / configurations for CVE-2023-26049

Vendor	Product	Version	Raw CPE
eclipse	jetty	< 9.4.51	cpe:2.3:a:eclipse:jetty::::::::
eclipse	jetty	>= 10.0.0, < 10.0.14	cpe:2.3:a:eclipse:jetty::::::::
eclipse	jetty	>= 11.0.0, < 11.0.14	cpe:2.3:a:eclipse:jetty::::::::
eclipse	jetty	12.0.0	cpe:2.3:a:eclipse:jetty:12.0.0:alpha1::::::
eclipse	jetty	12.0.0	cpe:2.3:a:eclipse:jetty:12.0.0:alpha2::::::
eclipse	jetty	12.0.0	cpe:2.3:a:eclipse:jetty:12.0.0:alpha3::::::
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
debian	debian_linux	11.0	cpe:2.3:o:debian:debian_linux:11.0:::::::*
debian	debian_linux	12.0	cpe:2.3:o:debian:debian_linux:12.0:::::::*
netapp	active_iq_unified_manager	—	cpe:2.3:a:netapp:active_iq_unified_manager:-:::::linux::
netapp	active_iq_unified_manager	—	cpe:2.3:a:netapp:active_iq_unified_manager:-:::::windows::
netapp	e-series_santricity_os_controller	>= 11.0	cpe:2.3:a:netapp:e-series_santricity_os_controller::::::::
netapp	e-series_santricity_unified_manager	—	cpe:2.3:a:netapp:e-series_santricity_unified_manager:-:::::::*
netapp	e-series_santricity_web_services	—	cpe:2.3:a:netapp:e-series_santricity_web_services:-:::::::*

References for CVE-2023-26049

URL	Tags
https://github.com/eclipse/jetty.project/pull/9339	Patch
https://github.com/eclipse/jetty.project/pull/9352	Patch
https://github.com/eclipse/jetty.project/security/advisories/GHSA-p26g-97m4-6q7c	Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00039.html	Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20230526-0001/	Third Party Advisory
https://www.debian.org/security/2023/dsa-5507	Third Party Advisory
https://www.rfc-editor.org/rfc/rfc2965	Technical Description
https://www.rfc-editor.org/rfc/rfc6265	Technical Description

URL

CVE-2023-26049 | Cookie parsing of quoted values can exfiltrate values from other cookies in Eclipse Jetty

Exploit prediction scoring system (EPSS) score for CVE-2023-26049

Common vulnerability scoring system (CVSS) metrics for CVE-2023-26049

Weakness enumeration for CVE-2023-26049

GitHub Security Advisory for CVE-2023-26049

OS Trackers for CVE-2023-26049

Affected software / configurations for CVE-2023-26049

References for CVE-2023-26049