CVE-2026-42154
ADVISORY - githubSummary
Impact
The remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory.
An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process.
Patches
Has the problem been patched? What versions should users upgrade to?
Fixed in 3.11.3 and 3.5.3 LTS. Users should upgrade to these versions or later.
Workarounds
User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read.
GitHub
CVSS SCORE
7.5high| Package | Type | OS Name | OS Version | Affected Ranges | Fix Versions |
|---|---|---|---|---|---|
| github.com/prometheus/prometheus | golang | - | - | <0.305.2 | 0.305.2 |
| github.com/prometheus/prometheus | golang | - | - | >=0.306.0,<0.311.3 | 0.311.3 |
| github.com/prometheus/prometheus | golang | - | - | >=1.0.0-rc.0,<=2.5.0 | Not yet available |
| github.com/prometheus/prometheus | golang | - | - | >=0.0.0-20160714024648-4d0c697548ec,<=0.0.0-20181106113856-67dc912ac8b2 | 0.0.0-20181106113856-67dc912ac8b2 |
CVSS:3 Severity and metrics
The CVSS metrics represent different qualitative aspects of a vulnerability that impact the overall score, as defined by the CVSS Specification.
The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone). One example of an Adjacent attack would be an ARP (IPv4) or neighbor discovery (IPv6) flood leading to a denial of service on the local LAN segment (e.g., CVE-2013-6014).
Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.
The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
The vulnerable system can be exploited without interaction from any user.
An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
There is no loss of confidentiality.
There is no loss of trust or accuracy within the impacted component.
There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component.
Docker
CVE-2026-42154
-
NIST
CVSS SCORE
7.5highAlpine
-
Debian
-
Ubuntu
-
CVSS SCORE
N/AmediumGoLang
-
Alma
-
CVSS SCORE
N/AhighAmazon
-
CVSS SCORE
N/AhighAmazon
-
CVSS SCORE
N/AhighBitnami
BIT-prometheus-2026-42154
3.9
CVSS SCORE
7.5highRocky
-
CVSS SCORE
N/AhighRocky
-
CVSS SCORE
N/AhighChainguard
CGA-j6q3-2q44-hhxx
-
minimos
MINI-23xg-538c-xj5f
-
minimos
MINI-24w2-qhqw-rp72
-
minimos
MINI-27pg-c34w-ph63
-
minimos
MINI-29rc-phqq-wqcm
-
minimos
MINI-2f34-96j3-w8mh
-
minimos
MINI-2hm8-h2f8-mq8r
-
minimos
MINI-2hvr-qmmx-gw49
-
minimos
MINI-2m8h-5j2f-vvfh
-
minimos
MINI-2pxw-cmrp-5g4m
-
minimos
MINI-36mx-mr33-3qw2
-
minimos
MINI-3ff5-wc7c-635p
-
minimos
MINI-3jfm-hhp7-3fv9
-
minimos
MINI-42qg-ww8j-wj73
-
minimos
MINI-43xv-4j9v-p466
-
minimos
MINI-44xc-xqxm-q3vf
-
minimos
MINI-462c-fj27-553w
-
minimos
MINI-47mw-wg93-fcx8
-
minimos
MINI-4c9v-xc7c-mvx3
-
minimos
MINI-4gf2-w2f8-x34q
-
minimos
MINI-4jwp-w6j8-hr76
-
minimos
MINI-4p3v-492h-4hv9
-
minimos
MINI-54qp-57jc-j7jp
-
minimos
MINI-57c5-rrqq-xfhv
-
minimos
MINI-5cwp-xxrm-6r62
-
minimos
MINI-5hhc-m6rm-88p2
-
minimos
MINI-5j25-7994-hg8c
-
minimos
MINI-5rrf-hhjx-q2gf
-
minimos
MINI-5vh9-fc6f-v229
-
minimos
MINI-5vjw-v888-87wj
-
minimos
MINI-5wrm-w97r-f7vj
-
minimos
MINI-64ww-mhgp-3mc2
-
minimos
MINI-692q-f84q-p3h3
-
minimos
MINI-6x7w-vr2f-6mfg
-
minimos
MINI-742x-wxcq-vmv7
-
minimos
MINI-75g8-vr74-9wh7
-
minimos
MINI-76fq-632p-fx4x
-
minimos
MINI-7g99-2hvp-cm4r
-
minimos
MINI-7gwg-pp66-3vx8
-
minimos
MINI-7qc5-rgq5-9534
-
minimos
MINI-7rvx-8mr4-3vcc
-
minimos
MINI-7w4x-f6qv-wpm9
-
minimos
MINI-8c78-7m57-j7hx
-
minimos
MINI-8cfv-v7cw-x239
-
minimos
MINI-8cg4-2jv2-rwp5
-
minimos
MINI-8cwc-7r92-xf2h
-
minimos
MINI-8g46-5j8m-4jg4
-
minimos
MINI-8g6x-v5vq-rfw7
-
minimos
MINI-8jvc-gqpj-qgwq
-
minimos
MINI-8xp2-qwxf-3g4j
-
minimos
MINI-8xvv-4r6r-9ww2
-
minimos
MINI-98r7-g73v-fj66
-
minimos
MINI-98wx-4hpm-q2gg
-
minimos
MINI-9gmx-fg44-2rxc
-
minimos
MINI-9jmh-cvg5-9hw7
-
minimos
MINI-9p52-79x8-h26f
-
minimos
MINI-9q9r-7qjq-qw87
-
minimos
MINI-9qpj-64jr-8vgx
-
minimos
MINI-9rvg-8vh4-v3qc
-
minimos
MINI-9v6j-5w4q-6cxf
-
minimos
MINI-9xm2-7mgg-3g6g
-
minimos
MINI-c3gp-4xqq-q22m
-
minimos
MINI-cq9m-c5pp-q6cf
-
minimos
MINI-cx37-2mj6-jprf
-
minimos
MINI-f2vh-wg2p-j52r
-
minimos
MINI-f5h2-pjwx-2pch
-
minimos
MINI-f884-73hx-p88x
-
minimos
MINI-f9vg-h52j-j385
-
minimos
MINI-fr9x-9c2v-g6g2
-
minimos
MINI-fxv5-f9qr-jcpr
-
minimos
MINI-g6p8-8f9v-mph9
-
minimos
MINI-g7f3-m6x8-97fg
-
minimos
MINI-g9hj-42r5-wmxp
-
minimos
MINI-gcf9-pq8h-rw8w
-
minimos
MINI-gg4c-x674-pvrw
-
minimos
MINI-gxqc-jpcg-x2q3
-
minimos
MINI-h3cx-g8v7-x6fx
-
minimos
MINI-h423-52gh-j95g
-
minimos
MINI-h759-jrm7-j5h4
-
minimos
MINI-hcqc-wgfv-4pj9
-
minimos
MINI-hjx3-6mhm-mrwq
-
minimos
MINI-hx8w-rc38-2xfm
-
minimos
MINI-jg46-qrqw-j3m6
-
minimos
MINI-jg4v-qw7m-9j44
-
minimos
MINI-jr9g-wcxw-g4jh
-
minimos
MINI-jv4p-grjq-hw4q
-
minimos
MINI-m23g-6c53-xfww
-
minimos
MINI-m55r-r77p-788p
-
minimos
MINI-m56r-fpgr-c46p
-
minimos
MINI-m5p7-q7hx-x788
-
minimos
MINI-m89p-4785-vc8h
-
minimos
MINI-mc35-77mx-hcfx
-
minimos
MINI-mgrj-77f2-6gj2
-
minimos
MINI-mmxc-6h58-4cvp
-
minimos
MINI-mp8j-9v7j-gvqv
-
minimos
MINI-mphj-9w6c-rrw3
-
minimos
MINI-mppf-3q74-8c44
-
minimos
MINI-mv5c-vrpm-9936
-
minimos
MINI-mvwq-8cf3-2xrj
-
minimos
MINI-p6j5-ffmm-mprv
-
minimos
MINI-p7ww-q7cq-ppm4
-
minimos
MINI-pfgh-p926-jxff
-
minimos
MINI-pg8g-4mhh-vf73
-
minimos
MINI-pgv7-p92h-2832
-
minimos
MINI-pgvm-3j55-7r49
-
minimos
MINI-pj3h-936q-jxx2
-
minimos
MINI-pqp2-vrwr-wf5p
-
minimos
MINI-prxq-7qjp-v7v9
-
minimos
MINI-pw28-hrqq-jj4h
-
minimos
MINI-q9r6-9c58-f76m
-
minimos
MINI-qc94-vf46-8hc7
-
minimos
MINI-qg5j-h9gf-3v7j
-
minimos
MINI-qqj2-xfrm-5hg5
-
minimos
MINI-qr3q-ccwh-8fc3
-
minimos
MINI-qv92-p7v2-p2m8
-
minimos
MINI-qxr3-fmvf-w2xp
-
minimos
MINI-r4f2-2j63-gg3q
-
minimos
MINI-r4vf-j2x6-r989
-
minimos
MINI-r8mp-79p8-x4p7
-
minimos
MINI-rgqr-vrqf-qh7x
-
minimos
MINI-rpr3-cv3m-jfc9
-
minimos
MINI-rwpw-mcx9-3c3h
-
minimos
MINI-rx2j-cfq9-9p4h
-
minimos
MINI-v265-g92h-4p2w
-
minimos
MINI-v5h4-ghmw-qjh4
-
minimos
MINI-v689-w233-cxp7
-
minimos
MINI-vcrm-rm7v-fcfm
-
minimos
MINI-vfg3-wp7g-jwf6
-
minimos
MINI-vjpj-xg8w-xvmp
-
minimos
MINI-vv6g-684j-xcxp
-
minimos
MINI-vwq7-x7cj-xf98
-
minimos
MINI-vxcr-gxxf-3rgc
-
minimos
MINI-w388-mghp-4h7x
-
minimos
MINI-w6r7-q3w9-22w2
-
minimos
MINI-w7rj-mh5w-g3m2
-
minimos
MINI-w96w-jx3h-8p87
-
minimos
MINI-wm4h-m86m-5w5r
-
minimos
MINI-wq86-6xwc-vg49
-
minimos
MINI-wrvh-fhrm-h44v
-
minimos
MINI-x34q-mj84-fc84
-
minimos
MINI-x4ph-jqjq-5rm7
-
minimos
MINI-x677-gx83-4p88
-
minimos
MINI-x69q-vfc4-mcm8
-
minimos
MINI-x6fm-gv29-pqg6
-
minimos
MINI-x76m-cj2v-279r
-
minimos
MINI-x7m8-gqcg-3x73
-
minimos
MINI-xcwf-r87g-jf2p
-
minimos
MINI-xmqx-7q53-xv3h
-
minimos
MINI-xqwc-qcjq-rw6x
-
minimos
MINI-xr77-xm9v-2928
-