CVE-2006-2786
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when...
2.6 LowFix available
CVE-2006-2786 is a low vulnerability (CVSS 2.6) in Mozilla Firefox, published June 2, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.77%, the 78th percentile. Fixed in thunderbird 1.5.0.4-1.
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
Exploit likelihood
1.77%Down 2.2 points since Feb 4, 2022
What each source reports
NVD Score used
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
- Record
CVE-2006-2786- CVSS 2.0
- 2.6 Low
AV:N/AC:H/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
CVE List No score
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
- Record
CVE-2006-2786- Updated
- 2026-11-02
EUVDEUVD-2006-2783 No score
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
- Record
EUVD-2006-2783- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-h93j-jrrw-xqfp No score
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when...
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
- Record
GHSA-h93j-jrrw-xqfp- Updated
- 2026-11-02
OSV No score
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
- Record
CVE-2006-2786- Updated
- 2026-11-02
OSVDEBIAN-CVE-2006-2786 No score
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
- Record
DEBIAN-CVE-2006-2786- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
thunderbirdDebian:12 |
before 1.5.0.4-1 | 1.5.0.4-1 |
thunderbirdDebian:13 |
before 1.5.0.4-1 | 1.5.0.4-1 |
thunderbirdDebian:14 |
before 1.5.0.4-1 | 1.5.0.4-1 |
mozillaDebian:3.1 |
before 2:1.7.8-1sarge7.1, plus listed versions 2:1.7.8-12:1.7.8-1sarge12:1.7.8-1sarge22:1.7.8-1sarge32:1.7.8-1sarge52:1.7.8-1sarge62:1.7.8-1sarge7 |
2:1.7.8-1sarge7.1 |
mozilla-firefoxDebian:3.1 |
before 1.0.4-2sarge9, plus listed versions 1.0.4-21.0.4-2sarge11.0.4-2sarge21.0.4-2sarge31.0.4-2sarge41.0.4-2sarge51.0.4-2sarge61.0.4-2sarge7 |
1.0.4-2sarge9 |
mozilla-thunderbirdDebian:3.1 |
before 1.0.2-2.sarge1.0.8a, plus listed versions 1.0.2-21.0.2-2.sarge1.0.61.0.2-2.sarge1.0.71.0.2-2.sarge1.0.8 |
1.0.2-2.sarge1.0.8a |
seamonkeyRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-chatRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-debuginfoRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-develRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
Show 96 moreShow less
| Package | Affected | Fixed |
|---|---|---|
seamonkey-dom-inspectorRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-js-debuggerRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-mailRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nsprRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nspr-develRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nssRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nss-develRed Hat:enterprise_linux:3::as |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkeyRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-chatRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-debuginfoRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-develRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-dom-inspectorRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-js-debuggerRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-mailRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nsprRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nspr-develRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nssRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nss-develRed Hat:enterprise_linux:3::desktop |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkeyRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-chatRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-debuginfoRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-develRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-dom-inspectorRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-js-debuggerRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-mailRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nsprRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nspr-develRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nssRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nss-develRed Hat:enterprise_linux:3::es |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkeyRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-chatRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-debuginfoRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-develRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-dom-inspectorRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-js-debuggerRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-mailRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nsprRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nspr-develRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nssRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
seamonkey-nss-develRed Hat:enterprise_linux:3::ws |
before 0:1.0.2-0.1.0.EL3 | 0:1.0.2-0.1.0.EL3 |
devhelpRed Hat:enterprise_linux:4::as |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-debuginfoRed Hat:enterprise_linux:4::as |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-develRed Hat:enterprise_linux:4::as |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
seamonkeyRed Hat:enterprise_linux:4::as |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-chatRed Hat:enterprise_linux:4::as |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-debuginfoRed Hat:enterprise_linux:4::as |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-develRed Hat:enterprise_linux:4::as |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-dom-inspectorRed Hat:enterprise_linux:4::as |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-js-debuggerRed Hat:enterprise_linux:4::as |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-mailRed Hat:enterprise_linux:4::as |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
devhelpRed Hat:enterprise_linux:4::desktop |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-debuginfoRed Hat:enterprise_linux:4::desktop |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-develRed Hat:enterprise_linux:4::desktop |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
seamonkeyRed Hat:enterprise_linux:4::desktop |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-chatRed Hat:enterprise_linux:4::desktop |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-debuginfoRed Hat:enterprise_linux:4::desktop |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-develRed Hat:enterprise_linux:4::desktop |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-dom-inspectorRed Hat:enterprise_linux:4::desktop |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-js-debuggerRed Hat:enterprise_linux:4::desktop |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-mailRed Hat:enterprise_linux:4::desktop |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
devhelpRed Hat:enterprise_linux:4::es |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-debuginfoRed Hat:enterprise_linux:4::es |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-develRed Hat:enterprise_linux:4::es |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
seamonkeyRed Hat:enterprise_linux:4::es |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-chatRed Hat:enterprise_linux:4::es |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-debuginfoRed Hat:enterprise_linux:4::es |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-develRed Hat:enterprise_linux:4::es |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-dom-inspectorRed Hat:enterprise_linux:4::es |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-js-debuggerRed Hat:enterprise_linux:4::es |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-mailRed Hat:enterprise_linux:4::es |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
devhelpRed Hat:enterprise_linux:4::ws |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-debuginfoRed Hat:enterprise_linux:4::ws |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
devhelp-develRed Hat:enterprise_linux:4::ws |
before 0:0.10-0.2.el4 | 0:0.10-0.2.el4 |
seamonkeyRed Hat:enterprise_linux:4::ws |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-chatRed Hat:enterprise_linux:4::ws |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-debuginfoRed Hat:enterprise_linux:4::ws |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-develRed Hat:enterprise_linux:4::ws |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-dom-inspectorRed Hat:enterprise_linux:4::ws |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-js-debuggerRed Hat:enterprise_linux:4::ws |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
seamonkey-mailRed Hat:enterprise_linux:4::ws |
before 0:1.0.3-0.el4.1 | 0:1.0.3-0.el4.1 |
firefoxRed Hat:enterprise_linux:4::as |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
firefox-debuginfoRed Hat:enterprise_linux:4::as |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
firefoxRed Hat:enterprise_linux:4::desktop |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
firefox-debuginfoRed Hat:enterprise_linux:4::desktop |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
firefoxRed Hat:enterprise_linux:4::es |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
firefox-debuginfoRed Hat:enterprise_linux:4::es |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
firefoxRed Hat:enterprise_linux:4::ws |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
firefox-debuginfoRed Hat:enterprise_linux:4::ws |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbirdRed Hat:enterprise_linux:4::as |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbird-debuginfoRed Hat:enterprise_linux:4::as |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbirdRed Hat:enterprise_linux:4::desktop |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbird-debuginfoRed Hat:enterprise_linux:4::desktop |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbirdRed Hat:enterprise_linux:4::es |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbird-debuginfoRed Hat:enterprise_linux:4::es |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbirdRed Hat:enterprise_linux:4::ws |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
thunderbird-debuginfoRed Hat:enterprise_linux:4::ws |
before 0:1.5.0.5-0.el4.1 | 0:1.5.0.5-0.el4.1 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
secunia.com/advisories/20709
mandriva.com/security/advisories?name=MDKSA-2006:145
vupen.com/english/advisories/2006/3748
usn.ubuntu.com/296-1
exchange.xforce.ibmcloud.com/vulnerabilities/26844
Show 166 moreShow less
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9966
redhat.com/support/errata/RHSA-2006-0594.html
securitytracker.com/id?1016214
securityfocus.com/archive/1/435795/100/0/threaded
rhn.redhat.com/errata/RHSA-2006-0609.html
gentoo.org/security/en/glsa/glsa-200606-21.xml
debian.org/security/2006/dsa-1118
novell.com/linux/security/advisories/2006_35_mozilla.html
mozilla.org/security/announce/2006/mfsa2006-33.html
nvd.nist.gov/vuln/detail/CVE-2006-2786
github.com/advisories/GHSA-h93j-jrrw-xqfp
security-tracker.debian.org/tracker/CVE-2006-2786
access.redhat.com/errata/RHSA-2006:0578
bugzilla.redhat.com/show_bug.cgi?id=196971
security.access.redhat.com/data/csaf/v2/advisories/2006/rhsa-2006_0578.json
cve.org/CVERecord?id=CVE-2006-2776