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NVD / CVE Program· CNA GitHub_M

CVE-2026-40898: quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.39% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: github.com/quic-go/quic-go (Go) 0.59.1; receptor (Red Hat:ansible_automation_platform_developer:2.5::el8) 0:1.6.7-1.el8ap; receptorctl (Red Hat:ansible_automation_platform_developer:2.5::el8) 0:1.6.7-1.el8ap.
  • Severity is disputed: the assigning authority (CNA) scores it 5.3, NVD 7.5.

Low priority for now. Upgrade to github.com/quic-go/quic-go (Go) 0.59.1; receptor (Red Hat:ansible_automation_platform_developer:2.5::el8) 0:1.6.7-1.el8ap; receptorctl (Red Hat:ansible_automation_platform_developer:2.5::el8) 0:1.6.7-1.el8ap or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or large values. The implementation builds an `http.Header` for the corresponding `http.Request` or `http.Response`, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go's HTTP/3 servers or clients by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1 enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK entries and checks the field section size after each entry, aborting the stream if an entry causes the limit to be exceeded.

Published
Jun 4, 2026
Updated
Jul 22, 2026
EPSS
0.3% · 34th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · GitHub_M
5.3
2.2 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-40898

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
quic-go projectquic-go

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • quic-go quic-go

    • < 0.59.1affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • quic-go project quic-gobefore 0.59.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12golang-github-lucas-clemente-quic-gofrom 0—
Gogithub.com/quic-go/quic-gobefore 0.59.10.59.1
Red Hat:ansible_automation_platform_developer:2.5::el8receptorbefore 0:1.6.7-1.el8ap0:1.6.7-1.el8ap
Red Hat:ansible_automation_platform_developer:2.5::el8receptorctlbefore 0:1.6.7-1.el8ap0:1.6.7-1.el8ap
Red Hat:ansible_automation_platform_developer:2.5::el9receptorctlbefore 0:1.6.7-1.el9ap0:1.6.7-1.el9ap
Red Hat:ansible_automation_platform_developer:2.6::el9automation-controllerbefore 0:4.7.15-2.el9ap0:4.7.15-2.el9ap
Red Hat:ansible_automation_platform_developer:2.6::el9automation-controller-clibefore 0:4.7.15-2.el9ap0:4.7.15-2.el9ap
Red Hat:ansible_automation_platform_inside:2.7::el9receptorbefore 0:1.6.7-1.el9ap0:1.6.7-1.el9ap
Red Hat:ansible_automation_platform:2.5::el8automation-controller-venv-towerbefore 0:4.6.31-1.el8ap0:4.6.31-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-eda-controllerbefore 0:1.1.21-1.el8ap0:1.1.21-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-eda-controller-basebefore 0:1.1.21-1.el8ap0:1.1.21-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-eda-controller-base-servicesbefore 0:1.1.21-1.el8ap0:1.1.21-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-eda-controller-event-stream-servicesbefore 0:1.1.21-1.el8ap0:1.1.21-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-eda-controller-worker-servicesbefore 0:1.1.21-1.el8ap0:1.1.21-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-gateway-proxybefore 0:2.5.10-7.el8ap0:2.5.10-7.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-gateway-proxy-debugsourcebefore 0:2.5.10-7.el8ap0:2.5.10-7.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-gateway-proxy-serverbefore 0:2.5.10-7.el8ap0:2.5.10-7.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-gateway-proxy-server-debuginfobefore 0:2.5.10-7.el8ap0:2.5.10-7.el8ap
Red Hat:ansible_automation_platform:2.5::el8python3.12-aiohttpbefore 0:3.14.1-2.el8ap0:3.14.1-2.el8ap
Red Hat:ansible_automation_platform:2.5::el8python3.12-daphnebefore 0:4.2.2-1.el8ap0:4.2.2-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8python3.12-pillowbefore 0:12.3.0-1.el8ap0:12.3.0-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8python3.12-pyasn1before 0:0.6.4-1.el8ap0:0.6.4-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8receptor-debuginfobefore 0:1.6.7-1.el8ap0:1.6.7-1.el8ap
Red Hat:ansible_automation_platform:2.5::el8receptor-debugsourcebefore 0:1.6.7-1.el8ap0:1.6.7-1.el8ap

+34

Same product

quic-go project: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-30591quic-go through 0.27.0 allows remote attackers to cause a denial of service (CPU consumption) via a Slowloris variant in which incomplete…
    31Monitor
  • CVE-2023-46239quic-go vulnerable to pointer dereference that can lead to panic
    30Monitor
  • CVE-2023-49295quic-go's path validation mechanism can cause denial of service
    26Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-64702Dec 11, 2025 · quic-go HTTP/3 QPACK Header Expansion DoS
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/quic-go/quic-go0.59.1Package registry (OSV)
red hat:automation-eda-controller0:1.1.21-1.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-eda-controller-base0:1.1.21-1.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-eda-controller-base-services0:1.1.21-1.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-eda-controller-event-stream-services0:1.1.21-1.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-eda-controller-worker-services0:1.1.21-1.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-gateway-proxy0:2.5.10-7.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-gateway-proxy-debugsource0:2.5.10-7.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-gateway-proxy-server0:2.5.10-7.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:caddy0:2.11.4-0.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3.12-aiohttp0:3.14.1-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:receptor0:1.6.7-1.el10ap · Red Hat:ansible_automation_platform:2.7::el10Package registry (OSV)
red hat:trivy0:0.69.3-1.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-64702175 days apartquic-go HTTP/3 QPACK Header Expansion DoS
    21Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records